HTMGT Base Communication

Change-Id: Ie1d9401128d6cfe21a6be1be1760c3ddb0059148
RTC: 115442
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/13863
Tested-by: Jenkins Server
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

18 files changed, 3467 insertions, 15 deletions

diff --git a/src/usr/htmgt/htmgt.C b/src/usr/htmgt/htmgt.C
new file mode 100644
index 000000000..e4625b0af
--- /dev/null
+++ b/src/usr/htmgt/htmgt.C
@@ -0,0 +1,169 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/htmgt/tmgtutility.C $                                 */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2014                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+
+#include <htmgt/htmgt.H>
+#include <htmgt/htmgt_reasoncodes.H>
+#include "htmgt_activate.H"
+#include "htmgt_config.H"
+#include "htmgt_utility.H"
+
+//  Targeting support
+#include <targeting/common/commontargeting.H>
+#include <targeting/common/utilFilter.H>
+#include <targeting/common/attributes.H>
+#include <targeting/common/targetservice.H>
+
+
+namespace HTMGT
+{
+
+    // Move the OCCs to active state or log unrecoverable error and
+    // stay in safe mode
+    void processOccStartStatus(const bool i_startCompleted,
+                               TARGETING::Target * i_failedOccTarget)
+    {
+        errlHndl_t l_err = NULL;
+
+        uint32_t l_huid = 0;
+        if (i_failedOccTarget)
+        {
+            l_huid = TARGETING::get_huid(i_failedOccTarget);
+        }
+        TMGT_INF("processOccStartStatus(Start Success=%c, failedOcc=0x%08X)",
+                 i_startCompleted?'y':'n', l_huid);
+        if (i_startCompleted)
+        {
+            // Query functional OCCs
+            if (occMgr::instance().buildOccs() > 0)
+            {
+                // Build pstate tables
+                // TODO RTC 114284
+
+                // Calc memory throttles
+                // TODO RTC 116306
+
+                // Send ALL config data
+                sendOccConfigData();
+
+                // Wait for all OCCs to go active
+                l_err = waitForOccsActive();
+                if (NULL == l_err)
+                    {
+                    // Set active sensors for all OCCs so BMC can start comm
+                    l_err = setOccActiveSensors();
+                }
+            }
+            else
+            {
+                TMGT_ERR("Unable to find any functional OCCs");
+                /*@
+                 * @errortype
+                 * @reasoncode      HTMGT_RC_OCC_UNAVAILABLE
+                 * @moduleid        HTMGT_MOD_LOAD_START_STATUS
+                 * @userdata1[0:7]  load/start completed
+                 * @devdesc         No functional OCCs were found
+                 */
+                bldErrLog(l_err, HTMGT_MOD_LOAD_START_STATUS,
+                          HTMGT_RC_OCC_UNAVAILABLE,
+                          i_startCompleted, 0, 0, 0,
+                          ERRORLOG::ERRL_SEV_INFORMATIONAL);
+            }
+        }
+        else
+        {
+            TMGT_ERR("All OCCs were not loaded/started successfully");
+            /*@
+             * @errortype
+             * @reasoncode      HTMGT_RC_OCC_START_FAIL
+             * @moduleid        HTMGT_MOD_LOAD_START_STATUS
+             * @userdata1       Failing OCC HUID
+             * @devdesc         OCCs were not loaded/started successfully
+             */
+            bldErrLog(l_err, HTMGT_MOD_LOAD_START_STATUS,
+                      HTMGT_RC_OCC_START_FAIL,
+                      l_huid, 0, 0, 0,
+                      ERRORLOG::ERRL_SEV_INFORMATIONAL);
+        }
+
+        if (NULL != l_err)
+        {
+            TMGT_ERR("OCCs not all active.  System will stay in safe mode");
+            // TODO: RTC 109066
+            //stopAllOccs();
+
+            // Update error log to unrecoverable and set SRC
+            // to indicate the system will remain in safe mode
+            /*@
+             * @errortype
+             * @reasoncode      HTMGT_RC_OCC_CRIT_FAILURE
+             * @moduleid        HTMGT_MOD_LOAD_START_STATUS
+             * @userdata1[0:7]  load/start completed
+             * @devdesc         OCCs did not all reach active state,
+             *                  system will be in Safe Mode
+             */
+            bldErrLog(l_err, HTMGT_MOD_LOAD_START_STATUS,
+                      HTMGT_RC_OCC_CRIT_FAILURE,
+                      i_startCompleted, 0, 0, 1,
+                      ERRORLOG::ERRL_SEV_UNRECOVERABLE);
+
+            // Add level 2 support callout
+            l_err->addProcedureCallout(HWAS::EPUB_PRC_LVL_SUPP,
+                                       HWAS::SRCI_PRIORITY_MED);
+            // Add HB firmware callout
+            l_err->addProcedureCallout(HWAS::EPUB_PRC_HB_CODE,
+                                       HWAS::SRCI_PRIORITY_MED);
+
+            ERRORLOG::errlCommit(l_err, HTMGT_COMP_ID);
+
+        }
+
+    } // end processOccStartStatus()
+
+
+
+    // Notify HTMGT that an OCC has an error to report
+    void processOccError(TARGETING::Target * i_occTarget)
+    {
+        const uint32_t l_huid = i_occTarget->getAttr<TARGETING::ATTR_HUID>();
+        TMGT_INF("processOccError(HUID=0x%08X) called", l_huid);
+        // TODO RTC 109224
+
+    } // end processOccError()
+
+
+
+
+    // Notify HTMGT that an OCC has failed and needs to be reset
+    void processOccReset(TARGETING::Target * i_failedOccTarget)
+    {
+        const uint32_t l_huid =
+            i_failedOccTarget->getAttr<TARGETING::ATTR_HUID>();
+        TMGT_INF("processOccReset(HUID=0x%08X) called", l_huid);
+        // TODO RTC 115296
+
+    } // end processOccReset()
+
+}
+
diff --git a/src/usr/htmgt/htmgt_activate.C b/src/usr/htmgt/htmgt_activate.C
new file mode 100644
index 000000000..e094b491f
--- /dev/null
+++ b/src/usr/htmgt/htmgt_activate.C
@@ -0,0 +1,148 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/htmgt/htmgt_activate.C $                              */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2014                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+
+#include <htmgt/htmgt.H>
+#include <htmgt/htmgt_reasoncodes.H>
+#include "htmgt_utility.H"
+#include "htmgt_activate.H"
+#include "htmgt_occcmd.H"
+#include "htmgt_config.H"
+#include "htmgt_poll.H"
+
+//  Targeting support
+#include <targeting/common/commontargeting.H>
+#include <targeting/common/utilFilter.H>
+#include <targeting/common/attributes.H>
+#include <targeting/common/targetservice.H>
+
+
+namespace HTMGT
+{
+
+// TODO RTC 118875
+#ifdef SIMICS_TESTING
+    uint8_t * G_simicsHomerBuffer = NULL;
+#endif
+
+
+    // Send all config data to the OCCs
+    // (see ToifNode::toif_manager_config() in src/tmgt/fsp/tmgt_toifnode.C)
+    void sendOccConfigData()
+    {
+        TMGT_INF("sendOccConfigData: STUB");
+        // TODO RTC 109066
+    }
+
+
+
+    // Wait for all OCCs to reach active ready state
+    // (see ToifNode::wait_for_occ_ready() in tmgt_toifnode.C)
+    errlHndl_t waitForOccReady()
+    {
+        errlHndl_t l_err = NULL;
+
+        l_err = sendOccPoll();
+
+        // TODO RTC 109066
+        if (NULL == l_err)
+        {
+            TMGT_ERR("waitForOccReady: Stub forcing failure");
+            /*@
+             * @errortype
+             * @reasoncode      HTMGT_RC_OCC_UNAVAILABLE
+             * @moduleid        HTMGT_MOD_WAIT_FOR_OCC_READY
+             * @devdesc         OCCs did not reach active ready state
+             */
+            bldErrLog(l_err, HTMGT_MOD_WAIT_FOR_OCC_READY,
+                      HTMGT_RC_OCC_UNAVAILABLE,
+                      0, 0, 0, 0,
+                      ERRORLOG::ERRL_SEV_INFORMATIONAL);
+        }
+
+        return l_err;
+    }
+
+
+
+    errlHndl_t setOccState(const occStateId i_state)
+    {
+        errlHndl_t l_err = NULL;
+
+        TMGT_INF("setOccState: STUB");
+        // TODO RTC 109066
+
+        return l_err;
+    }
+
+
+
+    // Wait for all OCCs to reach active state
+    errlHndl_t waitForOccsActive()
+    {
+        errlHndl_t l_err = NULL;
+
+        TMGT_INF("wait_for_occs_active called");
+
+        // Wait for attns - not needed?
+
+        // Wait for all OCCs to be ready for active state
+        l_err = waitForOccReady();
+        if (NULL == l_err)
+        {
+            // Send Set State (ACTIVE) to master
+            l_err = setOccState(OCC_STATE_ACTIVE);
+            if (NULL == l_err)
+            {
+                TMGT_INF("waitForOccsActive: OCCs are all active");
+            }
+        }
+        else
+        {
+            TMGT_ERR("waitForOccsActive: OCC(s) are not in active ready");
+        }
+
+        return l_err;
+
+    } // end waitForOccsActive()
+
+
+
+    // Set active sensors for all OCCs so BMC can start communication
+    errlHndl_t setOccActiveSensors()
+    {
+        errlHndl_t l_err = NULL;
+
+        TMGT_INF("setOccActiveSensors: STUB");
+        // TODO RTC 109066
+
+        return l_err;
+    }
+
+
+
+} // end namespace
+
+
+
diff --git a/src/usr/htmgt/htmgt_activate.H b/src/usr/htmgt/htmgt_activate.H
new file mode 100644
index 000000000..83cc79cec
--- /dev/null
+++ b/src/usr/htmgt/htmgt_activate.H
@@ -0,0 +1,79 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/htmgt/htmgt_activate.H $                              */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2014                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+
+#ifndef HTMGT_ACTIVATE_H
+#define HTMGT_ACTIVATE_H
+
+#include <stdint.h>
+#include "htmgt_occ.H"
+#include <errl/errlmanager.H>
+
+
+// TODO RTC 118875
+//#define SIMICS_TESTING
+
+
+namespace HTMGT
+{
+
+    /**
+     * @brief Build the pstate tables
+     */
+    void buildPstateTables();
+
+
+    /**
+     * @brief Calculate memory throttles
+     */
+    void calculateMemoryThrottles();
+
+
+    /**
+     * @brief Set the OCC state
+     *
+     * @param[in] i_state  Desired OCC state
+     *
+     * @return  NULL if success, else error handle
+     */
+    errlHndl_t setOccState(const occStateId i_state);
+
+
+    /**
+     * @brief Wait for all OCCs to go to active state
+     *
+     * @return  NULL if all OCCs reached active state, else error handle
+     */
+    errlHndl_t waitForOccsActive();
+
+
+    /**
+     * @brief Set active sensors for all OCCs so BMC can start communication
+     *
+     * @return  NULL if all sensors were updated, else error handle
+     */
+    errlHndl_t setOccActiveSensors();
+
+} // end namespace
+#endif
diff --git a/src/usr/htmgt/htmgt_common.mk b/src/usr/htmgt/htmgt_common.mk
index d2cc0d3bb..589cedd1b 100644
--- a/src/usr/htmgt/htmgt_common.mk
+++ b/src/usr/htmgt/htmgt_common.mk
@@ -23,4 +23,14 @@
 #
 # IBM_PROLOG_END_TAG
 # common objects between hostboot and hbrt
+OBJS += htmgt.o
+OBJS += htmgt_occ.o
+OBJS += htmgt_activate.o
+OBJS += htmgt_occcmd.o
+OBJS += htmgt_poll.o
 OBJS += htmgt_utility.o
+
+EXTRAINCDIR += ${ROOTPATH}/src/include/usr/ecmddatabuffer
+EXTRAINCDIR += ${ROOTPATH}/src/include/usr/hwpf/fapi
+EXTRAINCDIR += ${ROOTPATH}/src/include/usr/hwpf/plat
+EXTRAINCDIR += ${ROOTPATH}/src/include/usr/hwpf/hwp
diff --git a/src/usr/htmgt/htmgt_config.H b/src/usr/htmgt/htmgt_config.H
new file mode 100644
index 000000000..e87c5f381
--- /dev/null
+++ b/src/usr/htmgt/htmgt_config.H
@@ -0,0 +1,70 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/htmgt/tmgtutility.H $                                 */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2014                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+#ifndef HTMGT_CONFIG_H
+#define HTMGT_CONFIG_H
+
+#include <stdint.h>
+
+namespace HTMGT
+{
+
+    extern const uint8_t NUM_CFG_FORMATS;
+
+    enum occCfgDataFormat
+    {
+        OCC_CFGDATA_NO_REQUEST     = 0x00,  // no request for config data
+        OCC_CFGDATA_PSTATE_SSTRUCT = 0x01,  // Psate Super Structure
+        OCC_CFGDATA_FREQ_POINT     = 0x02,  // Frequency Operating Points
+        OCC_CFGDATA_OCC_ROLE       = 0x03,  // OCC Role
+        OCC_CFGDATA_APSS_CONFIG    = 0x04,  // APSS Config
+        OCC_CFGDATA_MEM_CONFIG     = 0x05,  // Memory Configuration
+        OCC_CFGDATA_FIR_SCOMS      = 0x06,  // FIR Scoms Table
+        OCC_CFGDATA_PCAP_CONFIG    = 0x07,  // PCAP Config
+        OCC_CFGDATA_SYS_CONFIG     = 0x0F,  // System Configuration
+        OCC_CFGDATA_MEM_THROTTLE   = 0x12,  // Memory Throttle Settings
+        OCC_CFGDATA_TCT_CONFIG     = 0x13,  // Thermal Contorl Treshold
+
+        OCC_CFGDATA_FORMAT_END,             // Marker to indicate last entry
+        OCC_CFGDATA_CLEAR_ALL      = 0xFF,  // Clear All Active Config Data
+    };
+
+
+    enum occDataState
+    {
+        OCC_DATA_NOT_AVAILABLE               = 0x00,
+        OCC_DATA_AVAILABLE                   = 0x01,
+        OCC_DATA_NEEDS_TO_BE_SENT            = 0x02,
+    };
+
+
+
+    // Send all config data to the OCCs
+    void sendOccConfigData();
+
+
+
+} // end namespace
+
+#endif
diff --git a/src/usr/htmgt/htmgt_occ.C b/src/usr/htmgt/htmgt_occ.C
new file mode 100644
index 000000000..2d0aaca11
--- /dev/null
+++ b/src/usr/htmgt/htmgt_occ.C
@@ -0,0 +1,286 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/htmgt/htmgt_occ.C $                                   */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2014                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+
+#include <htmgt/htmgt.H>
+#include <htmgt/htmgt_reasoncodes.H>
+#include "htmgt_utility.H"
+#include "htmgt_occcmd.H"
+#include "htmgt_config.H"
+#include "htmgt_occ.H"
+
+//  Targeting support
+#include <targeting/common/commontargeting.H>
+#include <targeting/common/utilFilter.H>
+#include <targeting/common/attributes.H>
+#include <targeting/common/targetservice.H>
+
+
+using namespace HTMGT;
+
+
+namespace HTMGT
+{
+
+    Occ::Occ(const uint8_t   i_instance,
+             const bool      i_masterCapable,
+             uint8_t       * i_homer,
+             TARGETING::TargetHandle_t i_target,
+             const occRole   i_role)
+        :instance(i_instance),
+        masterCapable(i_masterCapable),
+        role(i_role),
+        state(OCC_STATE_UNKNOWN),
+        commEstablished(false),
+        needsReset(false),
+        failed(false),
+        seqNumber(0),
+        homer(i_homer),
+        target(i_target),
+        lastPollValid(false),
+        version(0x01)
+    {
+        // Probably not needed...
+        huid = i_target->getAttr<TARGETING::ATTR_HUID>();
+    }
+
+    Occ::~Occ()
+    {
+    }
+
+
+    OccManager::OccManager()
+        :iv_occMaster(NULL),
+        iv_state(OCC_STATE_UNKNOWN)
+    {
+    }
+
+
+    OccManager::~OccManager()
+    {
+    }
+
+
+    // Remove all OCC objects
+    void OccManager::_removeAllOccs()
+    {
+        iv_occMaster = NULL;
+        if (iv_occArray.size() > 0)
+        {
+            for (std::vector<Occ*>::iterator pOcc = iv_occArray.begin();
+                 pOcc < iv_occArray.end();
+                 pOcc++)
+            {
+                TMGT_INF("removeAllOccs: Removing OCC%d",
+                         (*pOcc)->getInstance());
+                delete (*pOcc);
+            }
+            iv_occArray.clear();
+        }
+    }
+
+
+    // Query the functional OCCs and build OCC objects
+    uint32_t OccManager::_buildOccs()
+    {
+        TMGT_INF("buildOccs called");
+
+        // Remove existing OCC objects
+        _removeAllOccs();
+
+        // Get all functional processors
+        TARGETING::TargetHandleList pProcs;
+        TARGETING::getChipResources(pProcs,
+                                    TARGETING::TYPE_PROC,
+                                    TARGETING::UTIL_FILTER_FUNCTIONAL);
+        if (pProcs.size() > 0)
+        {
+            // for each functional processor
+            for(TARGETING::TargetHandleList::iterator proc = pProcs.begin();
+                proc != pProcs.end();
+                ++proc)
+            {
+                // Instance number for this Processor/OCC
+                const uint8_t instance =
+                    (*proc)->getAttr<TARGETING::ATTR_POSITION>();
+                TMGT_INF("buildOccs: PROC%d is functional", instance);
+                // Get HOMER virtual address
+                uint8_t * homer = (uint8_t*)
+                    ((*proc)->getAttr<TARGETING::ATTR_HOMER_VIRT_ADDR>());
+                TMGT_INF("buildOccs: homer = 0x%08X (from proc 0)", homer);
+#ifdef SIMICS_TESTING
+                // Starting of OCCs is not supported in SIMICS, so fake out
+                // HOMER memory area for testing
+                if (NULL == homer)
+                {
+                    extern uint8_t * G_simicsHomerBuffer;
+
+                    if (NULL == G_simicsHomerBuffer)
+                    {
+                        // Allocate a fake HOMER area
+                        G_simicsHomerBuffer =
+                            new uint8_t [HTMGT_OCC_CMD_ADDR+0x2000];
+                    }
+                    homer = G_simicsHomerBuffer;
+                    TMGT_ERR("buildOccs: Using hardcoded HOMER of 0x%08lX",
+                             homer);
+                }
+#endif
+
+                // Get functional OCC (one per proc)
+                TARGETING::TargetHandleList pOccs;
+                getChildChiplets(pOccs, *proc, TARGETING::TYPE_OCC);
+                if (pOccs.size() > 0)
+                {
+                    const unsigned long huid =
+                        pOccs[0]->getAttr<TARGETING::ATTR_HUID>();
+                    const bool masterCapable =
+                        pOccs[0]->getAttr<TARGETING::ATTR_OCC_MASTER_CAPABLE>();
+
+                    TMGT_INF("Found OCC %d - HUID: 0x%0lX, masterCapable: %c,"
+                             " homer: 0x%0lX",
+                             instance, huid, masterCapable?'Y':'N', homer);
+                    _addOcc(instance, masterCapable, homer, pOccs[0]);
+                }
+                else
+                {
+                    // OCC must not be functional
+                    TMGT_ERR("OCC%d not functional", instance);
+                }
+            }
+        }
+        else
+        {
+            TMGT_ERR("No functional processors found");
+        }
+
+        TMGT_INF("buildOccs: OCC Targets found = %d", _getNumOccs());
+
+        return _getNumOccs();
+
+    } // end OccManager::_buildOccs()
+
+
+
+    /* Add a functional OCC to be monitored */
+    void OccManager::_addOcc(const uint8_t   i_instance,
+                             const bool      i_masterCapable,
+                             uint8_t       * i_homer,
+                             TARGETING::TargetHandle_t i_target)
+    {
+        TMGT_INF("addOcc(%d, masterCapable=%c)",
+                 i_instance, i_masterCapable?'y':'n');
+
+        occRole role = OCC_ROLE_SLAVE;
+        if (true == i_masterCapable)
+        {
+            if (NULL == iv_occMaster)
+            {
+                // No master assigned yet, use this OCC
+                TMGT_INF("addOcc: OCC%d will be the master", i_instance);
+                role = OCC_ROLE_MASTER;
+            }
+            else
+            {
+                role = OCC_ROLE_BACKUP_MASTER;
+            }
+        }
+
+        Occ * l_occ = new Occ(i_instance,
+                              i_masterCapable,
+                              i_homer,
+                              i_target,
+                              role);
+
+        // Add OCC to the array
+        iv_occArray.push_back(l_occ);
+
+        if (OCC_ROLE_MASTER == role)
+        {
+            iv_occMaster = l_occ;
+        }
+
+    } // end OccManager::_addOcc()
+
+
+
+    uint8_t  OccManager::getNumOccs()
+    {
+        return Singleton<OccManager>::instance()._getNumOccs();
+    }
+
+
+    std::vector<Occ*> OccManager::getOccArray()
+    {
+        return Singleton<OccManager>::instance()._getOccArray();
+    }
+
+
+    uint32_t OccManager::buildOccs()
+    {
+        return Singleton<OccManager>::instance()._buildOccs();
+    }
+
+
+    Occ * OccManager::getMasterOcc()
+    {
+        return Singleton<OccManager>::instance()._getMasterOcc();
+    }
+
+
+
+#if 0
+    // TODO: RTC 109066
+    void update_occ_data()
+    {
+        if (occMgr::instance().getNumOccs() > 0)
+        {
+            // TBD: define as one block of data or in each OCC target?
+
+            uint32_t dataSize = occMgr::instance().getNumOccs() *
+                sizeof(occInstance);
+            if (dataSize > 256)
+            {
+                TMGT_ERR("update_occ_data: data exceeds attr size, truncating");
+                dataSize = 256;
+            }
+            // Update OCC_CONTROL_DATA Attribute
+            bool success = ->trySetAttr<ATTR_OCC_CONTROL_DATA>(dataSize, G_occ);
+            if (false == success)
+            {
+                TMGT_ERR("update_occ_data: failed to update OCC_CONTROL_DATA");
+            }
+        }
+        else
+        {
+            TMGT_INF("update_occ_data: No OCC data to update");
+        }
+    } // end update_occ_data()
+#endif
+
+
+} // end namespace
+
+
+
diff --git a/src/usr/htmgt/htmgt_occ.H b/src/usr/htmgt/htmgt_occ.H
new file mode 100644
index 000000000..64daf73c9
--- /dev/null
+++ b/src/usr/htmgt/htmgt_occ.H
@@ -0,0 +1,268 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/htmgt/htmgt_occ.H $                                   */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2014                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+
+#ifndef HTMGT_OCC_H
+#define HTMGT_OCC_H
+
+#include <stdint.h>
+#include <vector>
+
+
+namespace HTMGT
+{
+
+    const uint8_t  MASTER_OCC = 0xFF;
+
+    const uint32_t OCC_POLL_DATA_MIN_SIZE = 40;
+
+
+    enum occStateId
+    {
+        OCC_STATE_NO_CHANGE                = 0x00,
+        OCC_STATE_STANDBY                  = 0x01,
+        OCC_STATE_OBSERVATION              = 0x02,
+        OCC_STATE_ACTIVE                   = 0x03,
+        OCC_STATE_SAFE                     = 0x04,
+        OCC_STATE_RESET                    = 0x05,
+        OCC_STATE_IN_TRANSITION            = 0x07,
+        OCC_STATE_LOADING                  = 0x08,
+        OCC_STATE_UNKNOWN                  = 0x09,
+    };
+
+    enum occRole
+    {
+        OCC_ROLE_SLAVE          = 0,
+        OCC_ROLE_MASTER         = 1,
+        OCC_ROLE_BACKUP_MASTER  = 2,
+        OCC_ROLE_FIR_MASTER     = 3
+    };
+
+
+
+    /**
+     *  @class Occ
+     *
+     *  @brief OCC data class
+     *
+     *  @par Detailed Description:
+     *      Provides configuration data for a specific OCC.
+     *      Data will be saved during IPL so it can be used
+     *      at runtime.
+     */
+    class Occ
+    {
+        friend class OccManager;
+        friend class OccCmd;
+
+        public:
+            /**
+             * @brief Constructor
+             *
+             * @param[in] i_instance       OCC instance number
+             * @param[in] i_masterCapable  Is OCC capable of being master
+             * @param[in] i_homer          Virtual address of HOMER
+             * @param[in] i_target         OCC target pointer
+             */
+            Occ(const uint8_t   i_instance,
+                const bool      i_masterCapable,
+                uint8_t       * i_homer,
+                TARGETING::TargetHandle_t i_target,
+                const occRole   i_role);
+
+
+            /**
+             * @brief Destructor
+             */
+            ~Occ();
+
+
+            /**
+             * @brief Return the instance nubmer
+             *
+             * @return instance number for this OCC
+             */
+            const uint8_t getInstance() { return instance; };
+
+
+            /**
+             * @brief Return pointer to the last poll response
+             *
+             * @return pointer to last poll response
+             */
+            const uint8_t *getLastPollRsp() { return lastPollResponse; };
+
+
+            /**
+             * @brief Return pointer OCC target
+             *
+             * @return pointer to last poll response
+             */
+            TARGETING::TargetHandle_t getTarget() { return target; };
+
+
+        protected:
+            // Instance number of this OCC: 0 = first physical OCC
+            uint8_t         instance;
+            // true if this OCC is capable of Master role (wired to APSS)
+            bool            masterCapable;
+            // Role of this OCC
+            occRole         role;
+            // State of this OCC
+            occStateId      state;
+            // true if communication to this OCC has been established
+            bool            commEstablished;
+            // true if OCC needs to be reset
+            bool            needsReset;
+            // true if OCC failed
+            bool            failed;
+            // Sequence number of last/current OCC command
+            uint8_t         seqNumber;
+            // HOMER base address
+            uint8_t *       homer;
+            // OCC target
+            TARGETING::TargetHandle_t target;
+            // Last poll response (excluding sensor data)
+            uint8_t         lastPollResponse[OCC_POLL_DATA_MIN_SIZE];
+            // true if lastPollResponse contains valid data
+            bool            lastPollValid;
+
+            // HOM Unit Id of this OCC
+             TARGETING::ATTR_HUID_type  huid;
+
+
+        private:
+            // Version of data stored (0 = not written)
+            uint8_t         version;
+
+    };
+
+
+
+    /**
+     *  @class OccManager
+     *
+     *  @brief System / Node class
+     *
+     *  @par Detailed Description:
+     *      Manages all Occ classes and contains data specific to
+     *      this system / node.
+     */
+    class OccManager
+    {
+        friend class Occ;
+
+        public:
+            /**
+             * @brief Constructor
+             */
+            OccManager();
+
+
+            /**
+             * @brief Destructor
+             */
+            ~OccManager();
+
+
+            /**
+             * @brief Query the functional OCCs and build OCC objects
+             *
+             * @return  Return the number of OCC objects that were created
+             */
+            static uint32_t buildOccs();
+
+
+            /**
+             * @brief Get number of functional OCCs
+             *
+             * @return number of OCCs
+             */
+            static uint8_t getNumOccs();
+
+
+            /**
+             * @brief Return array of current OCCs
+             *
+             * @return vector of OCC objects
+             */
+            static std::vector<Occ*> getOccArray();
+
+
+            /**
+             * @brief Return pointer to master OCC
+             *
+             * @return pointer to master OCC
+             */
+            static Occ * getMasterOcc();
+
+
+        private:
+            Occ *                   iv_occMaster;
+            std::vector<Occ*>       iv_occArray;
+            occStateId              iv_state;
+
+            /* See buildOccs() above */
+            uint32_t _buildOccs();
+
+
+            /* See getNumOccs() above */
+            uint8_t _getNumOccs() { return iv_occArray.size(); };
+
+
+            /* See getOccArray() above */
+            std::vector<Occ*> _getOccArray() { return iv_occArray; };
+
+
+            /**
+             * @brief Remove all OCC objects
+             */
+            void _removeAllOccs();
+
+
+            /**
+             * @brief Add a functional OCC to be monitored
+             *
+             * @param[in] i_instance       OCC instance number
+             * @param[in] i_masterCapable  Is OCC capable of being master
+             * @param[in] i_homer          Virtual address of HOMER
+             * @param[in] i_target         OCC target pointer
+             * @param[in] i_role           OCC role
+             */
+            void  _addOcc(const uint8_t   i_instance,
+                          const bool      i_masterCapable,
+                          uint8_t       * i_homer,
+                          TARGETING::TargetHandle_t i_target);
+
+
+            /* See getMasterOcc() above */
+            Occ * _getMasterOcc() { return iv_occMaster; };
+
+
+    };
+
+    typedef Singleton<OccManager> occMgr;
+
+} // end namespace
+#endif
diff --git a/src/usr/htmgt/htmgt_occcmd.C b/src/usr/htmgt/htmgt_occcmd.C
new file mode 100644
index 000000000..7a238b5d5
--- /dev/null
+++ b/src/usr/htmgt/htmgt_occcmd.C
@@ -0,0 +1,1210 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/htmgt/htmgt_occcmd.C $                                */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2014                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+
+#include <htmgt/htmgt.H>
+#include <htmgt/htmgt_reasoncodes.H>
+#include "htmgt_occcmd.H"
+#include "htmgt_config.H"
+#include "htmgt_poll.H"
+
+//  Targeting support
+#include <targeting/common/commontargeting.H>
+#include <targeting/common/utilFilter.H>
+#include <targeting/common/attributes.H>
+#include <targeting/common/targetservice.H>
+
+#include <ecmdDataBufferBase.H>
+
+#include <sys/time.h>
+#include <trace/interface.H>
+#include <errl/errlmanager.H>
+#include <stdio.h>
+
+// TODO RTC 115922
+#ifdef __HOSTBOOT_RUNTIME
+#include <runtime/interface.h>
+#endif
+
+
+
+// TODO: RTC 115922
+#if 0
+#include <hwpf/hwp/occ/occAccess.H>
+#else
+namespace HBOCC
+{
+
+    /**
+     * @brief Write OCC Circular Buffer
+     *
+     * @param[in]     i_pTarget   PROC or OCC target pointer
+     * @param[in]     i_dataBuf   Reference to data buffer
+     * @return errlHndl_t   Error log if operation failed
+     */
+    errlHndl_t writeCircularBuffer(const TARGETING::Target*i_pTarget,
+                                        ecmdDataBufferBase & i_dataBuf)
+    {
+        errlHndl_t l_err = NULL;
+        TRACFCOMP( HTMGT::g_trac_htmgt, "writeCircularBuffer(STUB): "
+                   "setting status to 0xFF");
+        return l_err;
+    } // end writeCircularBuffer()
+
+} //end OCC namespace
+#endif
+
+
+
+namespace HTMGT
+{
+    uint8_t g_cmd = 0;
+    uint8_t g_seq = 0;
+
+    struct occCircBufferCmd_t
+    {
+        uint8_t senderId;
+        uint8_t commandType;
+        uint8_t reserved[6];
+    }__attribute__((packed));
+
+
+    // Note: Read length must be 8 byte aligned (for SRAM reads)
+    const uint16_t RD_MAX = (OCC_MAX_DATA_LENGTH - 8);
+    const uint16_t TO_20SEC = 20 * 1000;
+    const occCommandTable_t OccCmd::cv_occCommandTable[] =
+    {
+        // Command                   Support  RspCheck
+        //   RspLen  Timeout  ReadMax  Tracing
+        {OCC_CMD_POLL,                 0xE0,  OCC_CHECK_RSP_LENGTH_GREATER,
+            0x0028, TO_20SEC,  0x0017, OCC_TRACE_EXTENDED},
+        {OCC_CMD_CLEAR_ERROR_LOG,      0xC0,  OCC_CHECK_RSP_LENGTH_EQUALS,
+            0x0000, TO_20SEC,  0x0008, OCC_TRACE_EXTENDED},
+        {OCC_CMD_SET_STATE,            0xE0,  OCC_CHECK_RSP_LENGTH_EQUALS,
+            0x0000, TO_20SEC,  0x0008, OCC_TRACE_ALWAYS},
+        {OCC_CMD_SETUP_CFG_DATA,       0x80,  OCC_CHECK_RSP_LENGTH_EQUALS,
+            0x0000, TO_20SEC,  0x0008, OCC_TRACE_CONDITIONAL},
+        {OCC_CMD_SET_POWER_CAP,        0x80,  OCC_CHECK_RSP_LENGTH_NONE,
+            0x0000, TO_20SEC,  0x0090, OCC_TRACE_EXTENDED},
+        {OCC_CMD_RESET_PREP,           0x80,  OCC_CHECK_RSP_LENGTH_GREATER,
+            0x0006, TO_20SEC,  0x0190, OCC_TRACE_ALWAYS},
+        {OCC_CMD_GET_FIELD_DEBUG_DATA, 0x80,  OCC_CHECK_RSP_LENGTH_GREATER,
+            0x0001, TO_20SEC,  RD_MAX, OCC_TRACE_NEVER},
+
+        {OCC_CMD_END_OF_TABLE,         0x00,  OCC_CHECK_RSP_LENGTH_EQUALS,
+            0x0000, 0x0000,    0x0000, OCC_TRACE_NEVER}
+    };
+
+
+    /**
+     * @brief Get the index of the specified command in the command table
+     *
+     * @param[in] i_cmd  OCC command type
+     *
+     * @note If command not found/invalid, index to END_OF_TABLE will
+     *       be returned and checked by caller
+     *
+     * @return index into command table
+     */
+    uint8_t OccCmd::getCmdIndex(const occCommandType i_cmd)
+    {
+        uint8_t l_index = 0;
+
+        // TODO RTC 109066 - convert to use lower_bound
+        //= find(&cv_occCommandTable[0],
+        //       &cv_occCommandTable[OCC_CMDTABLE_SIZE-1],
+        //       i_cmd);
+
+        while ((cv_occCommandTable[l_index].cmdType != OCC_CMD_END_OF_TABLE) &&
+               (cv_occCommandTable[l_index].cmdType != i_cmd))
+        {
+            l_index++;
+        }
+
+        if (cv_occCommandTable[l_index].cmdType == OCC_CMD_END_OF_TABLE)
+        {
+            TMGT_ERR("getCmdIndex: Invalid cmd (0x%02X) specified", i_cmd);
+        }
+
+        return l_index;
+    }
+
+
+
+    /**
+     * @brief Convert OCC response status to a string
+     *
+     * @param[in] i_status OCC response status
+     *
+     * @return text string describing status
+     */
+    const char *rsp_status_string(const occReturnCodes i_status)
+    {
+        const uint8_t STATUS_STRING_COUNT = 11;
+        struct string_data_t
+        {
+            uint8_t       str_num;
+            const char    *str_data;
+        };
+        const static struct string_data_t L_status_string[STATUS_STRING_COUNT]=
+        {
+            {OCC_RC_SUCCESS, "SUCCESS"},
+            {OCC_RC_INVALID_COMMAND, "INVALID_COMMAND"},
+            {OCC_RC_INVALID_COMMAND_LENGTH, "INVALID_COMMAND_LENGTH"},
+            {OCC_RC_INVALID_DATA_FIELD, "INVALID_DATA_FIELD"},
+            {OCC_RC_CHECKSUM_FAILURE, "CHECKSUM_FAILURE"},
+            {OCC_RC_INTERNAL_ERROR, "INTERNAL_ERROR"},
+            {OCC_RC_PRESENT_STATE_PROHIBITS, "PRESENT_STATE_PROHIBITS"},
+            {OCC_RC_OCC_EXCEPTION, "OCC_EXCEPTION"},
+            {OCC_RC_OCC_INIT_CHECKPOINT, "OCC_INIT_FAILURE"},
+            {OCC_COMMAND_IN_PROGRESS, "IN_PROGRESS"},
+            {OCC_COMMAND_IN_PROGRESS, "UNKNOWN"}
+        };
+
+        uint8_t l_idx = 0;
+        // TODO RTC 109066
+        for (l_idx=0; l_idx < STATUS_STRING_COUNT; l_idx++)
+        {
+            if (i_status == L_status_string[l_idx].str_num)
+            {
+                // Return Code found
+                break;
+            }
+        }
+
+        if (STATUS_STRING_COUNT == l_idx)
+        {
+            // Set index to last entry record
+            l_idx = STATUS_STRING_COUNT - 1;
+        }
+
+        return L_status_string[l_idx].str_data;
+    }
+
+
+
+    // Constructor for OccCmd
+    OccCmd::OccCmd(Occ * i_occ,
+                   const occCommandType i_cmd,
+                   const uint16_t i_cmdDataLength,
+                   const uint8_t *i_data)
+        :iv_RetryCmd(false),
+        iv_OccCmd(),
+        iv_OccRsp(),
+        iv_Occ(i_occ)
+    {
+        iv_OccCmd.cmdType = i_cmd;
+        iv_OccCmd.dataLength = i_cmdDataLength;
+        if (0 != i_cmdDataLength)
+        {
+            if (i_cmdDataLength > OCC_MAX_DATA_LENGTH)
+            {
+                TMGT_ERR("OccCmd: truncating data length (0x%04X)",
+                         i_cmdDataLength);
+                iv_OccCmd.dataLength = OCC_MAX_DATA_LENGTH;
+            }
+            memcpy(iv_OccCmd.cmdData, i_data, iv_OccCmd.dataLength);
+        }
+
+    } // end OccCmd()
+
+
+
+    // Destructor for OccCmd
+    OccCmd::~OccCmd()
+    {
+    }
+
+
+    // Determine if command needs to be traced and if so, trace it.
+    bool OccCmd::traceCommand()
+    {
+        bool o_cmdWasTraced = true;
+        const uint8_t l_instance = iv_Occ->instance;
+
+        const uint8_t l_cmd_index = getCmdIndex(iv_OccCmd.cmdType);
+        if (OCC_CMD_END_OF_TABLE != cv_occCommandTable[l_cmd_index].cmdType)
+        {
+            switch(cv_occCommandTable[l_cmd_index].traceCmd)
+            {
+                case OCC_TRACE_ALWAYS:
+                    // Always trace command
+                    break;
+
+                case OCC_TRACE_EXTENDED:
+                    // Trace command when tracing enabled
+                    o_cmdWasTraced = (G_debug_trace & DEBUG_TRACE_OCCCMD);
+                    break;
+
+                case OCC_TRACE_NEVER:
+                    // Never trace these cmds (unless full tracing enabled)
+                    o_cmdWasTraced = (G_debug_trace&DEBUG_TRACE_OCCCMD_FULL);
+                    break;
+
+                default:
+                    if ((OCC_CMD_SETUP_CFG_DATA==iv_OccCmd.cmdType) &&
+                        (iv_OccCmd.dataLength > 0) &&
+                        ((iv_OccCmd.cmdData[0] ==
+                          OCC_CFGDATA_PSTATE_SSTRUCT)))
+                    {
+                        // Dont trace Pstate data (unless full tracing)
+                        o_cmdWasTraced = (G_debug_trace &
+                                          DEBUG_TRACE_OCCCMD_FULL);
+                    }
+                    break;
+            }
+        }
+
+        if (o_cmdWasTraced)
+        {
+            // Trace command (and up to 16 bytes of data)
+            if ((OCC_CMD_SETUP_CFG_DATA == iv_OccCmd.cmdType) &&
+                (iv_OccCmd.dataLength > 0))
+            {
+                // Trace config format and first parms since TRACFBIN does
+                // not always work
+                TMGT_INF("Send OCC%d cmd=0x%02X (%s), length=0x%04X,"
+                         " data=0x%08X...",
+                         l_instance, iv_OccCmd.cmdType,
+                         command_string(iv_OccCmd.cmdType),
+                         iv_OccCmd.dataLength,
+                         UINT32_GET(iv_OccCmd.cmdData));
+            }
+            else
+            {
+                TMGT_INF("Send OCC%d cmd=0x%02X (%s), length=0x%04X",
+                         l_instance, iv_OccCmd.cmdType,
+                         command_string(iv_OccCmd.cmdType),
+                         iv_OccCmd.dataLength);
+            }
+            if (iv_OccCmd.dataLength > 0)
+            {
+                TMGT_BIN("cmd data", iv_OccCmd.cmdData,
+                         std::min(iv_OccCmd.dataLength,(uint16_t)16));
+            }
+        }
+
+        return o_cmdWasTraced;
+
+    } // end OccCmd::traceCommand()
+
+
+    void OccCmd::traceResponse()
+    {
+        char l_rsp_status_string[64] = "";
+        const uint8_t l_instance = iv_Occ->instance;
+
+        if (iv_OccRsp.returnStatus != OCC_RC_SUCCESS)
+        {
+            sprintf(l_rsp_status_string, " (%s)",
+                    rsp_status_string(iv_OccRsp.returnStatus));
+        }
+
+        // TODO RTC 109224 - refactor/optimize trace strings
+        TMGT_INF("OCC%d rsp status=0x%02X%s, length=0x%04X",
+                 l_instance, iv_OccRsp.returnStatus,
+                 l_rsp_status_string, iv_OccRsp.dataLength);
+        if (iv_OccRsp.dataLength > 0)
+        {
+            TMGT_BIN("rsp data:", iv_OccRsp.rspData,
+                     std::min(iv_OccRsp.dataLength,(uint16_t)16));
+        }
+    }
+
+
+    // Process the OCC response and determine if retry is required
+    void OccCmd::processOccResponse(errlHndl_t & io_errlHndl,
+                                    const bool i_traceRsp)
+    {
+        const uint8_t l_instance = iv_Occ->instance;
+        const bool alreadyRetriedOnce = iv_RetryCmd;
+        iv_RetryCmd = false;
+
+        if (i_traceRsp)
+        {
+            traceResponse();
+        }
+
+        if (io_errlHndl == NULL)
+        {
+            // A response was received
+            io_errlHndl = checkOccResponse();
+            if (io_errlHndl != NULL)
+            {
+                // Error checking on response failed...
+                if ((alreadyRetriedOnce == false) &&
+                    (OCC_RC_PRESENT_STATE_PROHIBITS != iv_OccRsp.returnStatus))
+                {
+                    // A retry has not been sent yet, commit/delete the error
+                    // and retry.  Add OCC command data to user details
+                    // TODO RTC 115922
+                    //io_errlHndl->addUsrDtls(iv_OccCmd.cmdData,
+                    // iv_OccCmd.dataLength, HTMGT_COMP_ID,
+                    // 0/*version*/, TMGT_OCC_CMD_DATA);
+                    ERRORLOG::errlCommit(io_errlHndl, HTMGT_COMP_ID);
+                    iv_RetryCmd = true;
+                    // Clear/init the response data structure
+                    memset(&iv_OccRsp, 0x00, sizeof(occResponseStruct_t));
+                    iv_OccRsp.returnStatus = OCC_COMMAND_IN_PROGRESS;
+                }
+                else
+                {
+                    // A retry has already been sent...
+                    TMGT_ERR("OCC%d cmd 0x%02X failed retry, status=0x%02X,"
+                             " returned length=0x%04X",
+                             l_instance, iv_OccCmd.cmdType,
+                             iv_OccRsp.returnStatus, iv_OccRsp.dataLength);
+                    if (iv_OccRsp.dataLength)
+                    {
+                        TMGT_BIN("OCC rsp data:", iv_OccRsp.rspData,
+                                 iv_OccRsp.dataLength);
+                    }
+
+                    if ( /*(TMGT_RC_CHECKSUM_FAIL == io_errlHndl->getRC()) ||*/
+                         (OCC_RC_CHECKSUM_FAILURE == iv_OccRsp.returnStatus) ||
+                         (OCC_RC_INTERNAL_ERROR == iv_OccRsp.returnStatus) )
+                    {
+                        // failed due to rsp data checksum failure... reset OCC
+                        TMGT_ERR("processOccResponse: OCC%d response had"
+                                 " checksum or internal error,"
+                                 " need to RESET OCC", l_instance);
+                        iv_Occ->needsReset = true;
+                        // Mark OCC as failed
+                        iv_Occ->failed = true;
+                    }
+                }
+            }
+            // else response was good
+        }
+        else
+        {
+            // Send of OCC command failed
+            if ( /*(TMGT_RC_SEND_FAIL == io_errlHndl->getRC()) &&*/
+                 (alreadyRetriedOnce == true) )
+            {
+                // failed due to send/receive problem and retry has been
+                // sent... reset OCC
+                TMGT_ERR("Sending OCC%d command failed twice, need to RESET"
+                         " OCC", l_instance);
+                iv_Occ->needsReset = true;
+                // Unable to communicate with OCC, mark as failed
+                iv_Occ->failed = true;
+            }
+            else
+            {
+                if ((alreadyRetriedOnce == false) &&
+                     (OCC_RC_PRESENT_STATE_PROHIBITS != iv_OccRsp.returnStatus))
+                {
+                    // A retry has not been sent yet, commit the error
+                    // and retry.
+                    // Add OCC command data to user details
+                    // TODO RTC 115922
+                    //io_errlHndl->addUsrDtls(iv_OccCmd.cmdData,
+                    //iv_OccCmd.dataLength, HTMGT_COMP_ID,
+                    //0/*version*/, TMGT_OCC_CMD_DATA);
+                    ERRORLOG::errlCommit(io_errlHndl, HTMGT_COMP_ID);
+                    iv_RetryCmd = true;
+
+                    // Clear/init the response data structure
+                    memset(&iv_OccRsp, 0x00, sizeof(occResponseStruct_t));
+                    iv_OccRsp.returnStatus = OCC_COMMAND_IN_PROGRESS;
+                }
+                else
+                {
+                    // A retry has already been sent...
+                    TMGT_ERR("OCC%d cmd 0x%02X failed.  status=0x%02X,"
+                             " returned length=0x%04X",
+                             l_instance, iv_OccCmd.cmdType,
+                             iv_OccRsp.returnStatus, iv_OccRsp.dataLength);
+                    if (iv_OccRsp.dataLength)
+                    {
+                        TMGT_BIN("response data:", iv_OccRsp.rspData,
+                                 iv_OccRsp.dataLength);
+                    }
+
+                    if ( /*(TMGT_RC_CHECKSUM_FAIL == io_errlHndl->getRC()) ||*/
+                         (OCC_RC_CHECKSUM_FAILURE == iv_OccRsp.returnStatus) ||
+                         (OCC_RC_INTERNAL_ERROR == iv_OccRsp.returnStatus) )
+                    {
+                        // failed due to rsp data checksum failure... reset OCC
+                        TMGT_ERR("processOccResponse: OCC%d response had"
+                                 " checksum or internal error,"
+                                 " need to RESET OCC", l_instance);
+                        iv_Occ->needsReset = true;
+                        // Unable to communicate with OCC, mark as failed
+                        iv_Occ->failed = true;
+                    }
+                }
+            }
+        }
+    } // end OccCmd::processOccResponse()
+
+
+    // Send command to OCC
+    errlHndl_t OccCmd::sendOccCmd()
+    {
+        errlHndl_t l_errlHndl = NULL;
+        uint8_t l_cmd_index = 0;
+        iv_OccRsp.returnStatus = OCC_COMMAND_IN_PROGRESS;
+
+        if (iv_Occ != NULL)
+        {
+            const occStateId l_occState = iv_Occ->state;
+            l_cmd_index = getCmdIndex(iv_OccCmd.cmdType);
+            if (OCC_CMD_END_OF_TABLE!=cv_occCommandTable[l_cmd_index].cmdType)
+            {
+                const bool cmdTraced = traceCommand();
+
+                const bool l_commEstablished = iv_Occ->commEstablished;
+                if ( (true == l_commEstablished) ||
+                     ((false == l_commEstablished) &&
+                      (OCC_CMD_POLL == iv_OccCmd.cmdType)) )
+                {
+                    iv_RetryCmd = false;
+                    do
+                    {
+                        // Send the command and receive the response
+                        l_errlHndl = writeOccCmd();
+
+                        processOccResponse(l_errlHndl, cmdTraced);
+
+                    } while (iv_RetryCmd);
+                }
+                else
+                {
+                    // Ignore failure on GET_FIELD_DEBUG_DATA
+                    if (OCC_CMD_GET_FIELD_DEBUG_DATA != iv_OccCmd.cmdType)
+                    {
+                        // Comm not established or command not supported
+                        /*@
+                         * @errortype
+                         * @reasoncode HTMGT_RC_OCC_UNAVAILABLE
+                         * @moduleid HTMGT_MOD_SEND_OCC_CMD
+                         * @userdata1 OCC command
+                         * @userdata2 comm established
+                         * @userdata3 OCC state
+                         * @userdata4 1
+                         * @devdesc OCC comm not established or command is not
+                         *          supported
+                         */
+                        bldErrLog(l_errlHndl, HTMGT_MOD_SEND_OCC_CMD,
+                                  HTMGT_RC_OCC_UNAVAILABLE,
+                                  iv_OccCmd.cmdType, l_commEstablished,
+                                  l_occState, 1,
+                                  ERRORLOG::ERRL_SEV_INFORMATIONAL);
+                    }
+                }
+            }
+            else
+            {
+                TMGT_ERR("sendOccCmd: ignoring invalid command 0x%02X",
+                         iv_OccCmd.cmdType);
+                /*@
+                 * @errortype
+                 * @reasoncode HTMGT_RC_INVALID_DATA
+                 * @moduleid HTMGT_MOD_SEND_OCC_CMD
+                 * @userdata1 OCC command type
+                 * @devdesc Ignoring invalid command
+                 */
+                bldErrLog(l_errlHndl, HTMGT_MOD_SEND_OCC_CMD,
+                          HTMGT_RC_INVALID_DATA,
+                          iv_OccCmd.cmdType, 0, 0, 0,
+                          ERRORLOG::ERRL_SEV_INFORMATIONAL);
+            }
+        }
+        else
+        {
+            TMGT_ERR("sendOccCmd: ignoring command 0x%02X due to NULL OCC",
+                     iv_OccCmd.cmdType);
+            /*@
+             * @errortype
+             * @reasoncode HTMGT_RC_INTERNAL_ERROR
+             * @moduleid HTMGT_MOD_SEND_OCC_CMD
+             * @userdata1 OCC command type
+             * @devdesc OCC is not valid
+             */
+            bldErrLog(l_errlHndl, HTMGT_MOD_SEND_OCC_CMD,
+                      HTMGT_RC_INTERNAL_ERROR,
+                      iv_OccCmd.cmdType, 0, 0, 0,
+                      ERRORLOG::ERRL_SEV_INFORMATIONAL);
+        }
+
+        if (l_errlHndl)
+        {
+            // Add OCC command data to user details
+            // TODO RTC 115922
+            //l_errlHndl->addUsrDtls(iv_OccCmd.cmdData,
+            //                       iv_OccCmd.dataLength, HTMGT_COMP_ID,
+            //                       0/*version*/, TMGT_OCC_CMD_DATA);
+        }
+
+        return l_errlHndl;
+
+    } // end OccCmd::sendOccCmd()
+
+
+
+#ifdef SIMICS_TESTING
+    // Auto-responder for testing in simics
+    void OccCmd::fakeOccResponse()
+    {
+        static uint8_t L_state = 0;
+        static uint8_t L_prior_status = 0x00;
+        static uint8_t L_prior_sequence = 0x00;
+        uint8_t * const rspBuffer = iv_Occ->homer + HTMGT_OCC_RSP_ADDR;
+
+        if (0 == L_state)
+        {
+            if (G_debug_data != 0x02)
+            {
+                TMGT_INF("fakeOccResponse: status=0xFF");
+                rspBuffer[0] = g_seq;
+                rspBuffer[1] = g_cmd;
+                rspBuffer[2] = 0xFF; // status
+                ++L_state;
+
+                if (G_debug_data == 0x01)
+                {
+                    L_state = 0; // force command timeout
+                }
+            }
+        }
+        else
+        {
+            if (G_debug_data != 0xE0)
+            {
+                TMGT_INF("fakeOccResponse: status=0x00");
+                rspBuffer[2] = 0x00; // status
+
+                // Add full reseponse data
+                const uint16_t dataLength = OCC_POLL_DATA_MIN_SIZE;
+                const occPollRspStruct_t poll_rsp_data = {
+                    // Status 0x8B = Master, AttnEnabled, ObsReady, ActReady
+                    0x8B,
+                    0, // extStatus;
+                    0x01, // occsPresent;
+                    0, // requestedCfg;
+                    0, // state;
+                    0x0000, // reserved;
+                    0, // errorId;
+                    0x00000000, // errorAddress;
+                    0x0000, // errorLength;
+                    0x0000, // reserved2;
+                    { "occ825_simicsFF" }, // codeLevel[16];
+                    { 'S', 'E', 'N', 'S', 'O', 'R' }, // sensor[6];
+                    0, // numBlocks;
+                    0x01 // version;
+                    //uint8_t   sensorData[4049];
+                };
+                UINT16_PUT(&rspBuffer[3], dataLength);
+                TMGT_INF("fakeOccResponse: data length=%d", dataLength);
+                if (dataLength)
+                {
+                    memcpy(&rspBuffer[5], &poll_rsp_data, dataLength);
+                }
+                uint16_t checksum = 0;
+                const uint16_t checksumOffset = OCC_RSP_HDR_LENGTH +
+                    dataLength - 2;
+                for (uint16_t l_index = 0; l_index < checksumOffset; l_index++)
+                {
+                    checksum += rspBuffer[l_index];
+                }
+                if (G_debug_data == 0x03)
+                {
+                    TMGT_INF("fakeOccResponse: corrupting checksum"
+                             " (good=0x%04X)", checksum);
+                    checksum++;
+                }
+                TMGT_INF("fakeOccResponse: Writing checksum 0x%04X to offset"
+                         " 0x%04X", checksum, checksumOffset);
+                UINT16_PUT(&rspBuffer[checksumOffset], checksum);
+            }
+            else
+            {
+                TMGT_INF("fakeOccResponse: status=0xE1");
+                rspBuffer[2] = 0xE0; // status
+                const uint16_t dataLength = 32;
+                UINT16_PUT(&rspBuffer[3], dataLength);
+                const uint8_t excpData[dataLength] = { 0x11, 0x22, 0x33, 0x44 };
+                TMGT_INF("fakeOccResponse: data length=%d", dataLength);
+                if (dataLength)
+                {
+                    memcpy(&rspBuffer[5], &excpData, dataLength);
+                }
+            }
+
+            L_state = 0;
+        }
+
+        // Check response buffer
+        if (L_prior_status != rspBuffer[2])
+        {
+            TMGT_INF("fakeOccResponse: status updated to 0x%02X",
+                     rspBuffer[2]);
+            L_prior_status = rspBuffer[2];
+        }
+        if (L_prior_sequence != rspBuffer[0])
+        {
+            TMGT_INF("fakeOccResponse: sequence updated to 0x%02X"
+                     " (expecting=0x%02X)",
+                     rspBuffer[0], iv_Occ->seqNumber);
+            L_prior_sequence = rspBuffer[0];
+        }
+
+    } // end fakeOccResponse()
+#endif
+
+
+
+    // Returns true if timeout waiting for response
+    bool OccCmd::waitForOccRsp(uint32_t i_timeout)
+    {
+        const uint8_t * const rspBuffer = iv_Occ->homer + HTMGT_OCC_RSP_ADDR;
+        uint16_t rspLength = 0;
+        if (G_debug_trace & DEBUG_TRACE_VERBOSE)
+        {
+            TMGT_INF("waitForOccRsp(%d) address=0x%08X", i_timeout, rspBuffer);
+        }
+
+        bool l_time_expired = true;
+        const uint32_t OCC_RSP_SAMPLE_TIME = 100; // in milliseconds
+        uint32_t l_msec_remaining = std::max(i_timeout, OCC_RSP_SAMPLE_TIME);
+        while (l_msec_remaining > 0)
+        {
+#ifdef SIMICS_TESTING
+            fakeOccResponse();
+#endif
+            // 1. When OCC receives the command, they will set the status to
+            //    COMMAND_IN_PROGRESS.
+            // 2. When the response is ready they will update the full
+            //    response buffer (except the status)
+            // 3. The status field is updated last to indicate response ready
+            //
+            // Note: Need to check the sequence number to be sure we are
+            //       processing the expected response
+            if ((OCC_COMMAND_IN_PROGRESS != rspBuffer[2]) &&
+                (iv_Occ->seqNumber == rspBuffer[0]))
+            {
+                // Need an 'isync' here to ensure that previous instructions
+                // have completed before the code continues on. This is a type
+                // of read-barrier.  Without this the processor can do
+                // speculative reads of the HOMER data and you can actually
+                // get stale data as part of the instructions that happen
+                // afterwards. Another 'weak consistency' issue.
+                isync();
+
+                // OCC must have processed the command
+                const uint16_t rspDataLen = UINT16_GET(&rspBuffer[3]);
+                rspLength = OCC_RSP_HDR_LENGTH + rspDataLen;
+                if (G_debug_trace & DEBUG_TRACE_OCCCMD)
+                {
+                    TMGT_INF("waitForOccRsp: OCC%d rsp (huid=0x%08X,"
+                             " rsp length=%d)",
+                             iv_Occ->instance, iv_Occ->huid, rspLength);
+                    TMGT_BIN("waitForOccRsp: OCC rsp data (up to 256 bytes)",
+                             rspBuffer, std::min(rspLength, (uint16_t)256));
+                }
+                l_time_expired = false;
+                break;
+            }
+
+            // delay before next check
+            const uint32_t l_sleep_msec = std::min(l_msec_remaining,
+                                                   OCC_RSP_SAMPLE_TIME);
+
+            // TODO RTC 115922
+#ifndef __HOSTBOOT_RUNTIME
+            nanosleep( 0, NS_PER_MSEC * l_sleep_msec );
+#else
+            if(g_hostInterfaces && g_hostInterfaces->nanosleep)
+            {
+                g_hostInterfaces->nanosleep(0, NS_PER_MSEC * l_sleep_msec);
+            }
+#endif
+            l_msec_remaining -= l_sleep_msec;
+
+        } // while
+
+        if (l_time_expired)
+        {
+            // timeout waiting for response
+            TMGT_ERR("waitForOccRsp: OCC%d timeout waiting for response"
+                     " (%d sec)",
+                     iv_Occ->instance, i_timeout/1000);
+        }
+
+        return l_time_expired;
+
+    } // end OccCmd::waitForOccRsp()
+
+
+
+    // Create/commit an error log with the OCC exception data
+    void OccCmd::handleOccException(void)
+    {
+        // Exception length includes response header (w/o checksum) and
+        // the data length
+        uint32_t l_exceptionDataLength = OCC_RSP_HDR_LENGTH - 2 +
+            iv_OccRsp.dataLength;
+
+        TMGT_ERR("handleOccException: OCC%d returned abnormal rsp status of"
+                 " 0x%02X, rsp len=%d",
+                 iv_Occ->instance, iv_OccRsp.returnStatus,
+                 l_exceptionDataLength);
+        if (l_exceptionDataLength > 4*KILOBYTE)
+        {
+            TMGT_INF("handleOccException: truncating data length to 4K");
+            l_exceptionDataLength = 4*KILOBYTE;
+            // TODO RTC 109224 - HB elogs are only 4K
+        }
+
+        /*@
+         * @errortype
+         * @reasoncode HTMGT_RC_INTERNAL_ERROR
+         * @moduleid HTMGT_MOD_HANLDE_OCC_EXCEPTION
+         * @userdata1[0-15] rsp status
+         * @userdata1[16-31] exception data length
+         * @userdata2[0-15] huid
+         * @userdata2[16-31]
+         * @devdesc OCC reported exception
+         */
+        errlHndl_t l_excErr = NULL;
+        bldErrLog(l_excErr, HTMGT_MOD_HANLDE_OCC_EXCEPTION,
+                  (htmgtReasonCode)(OCCC_COMP_ID | iv_OccRsp.returnStatus),
+                  iv_OccRsp.returnStatus, iv_OccRsp.dataLength,
+                  iv_Occ->huid, 0,
+                  ERRORLOG::ERRL_SEV_INFORMATIONAL //,
+                  //false, // dont skip traces
+                  //            OCCC_COMP_ID);
+                  // TODO RTC 115922
+                  //l_excErr->addUsrDtls(l_excp_buffer, l_excp_length,
+                  //                     OCCC_COMP_ID, 1 /*version*/,
+                  //                     iv_OccRsp.returnStatus/*type*/
+            );
+        ERRORLOG::errlCommit(l_excErr, HTMGT_COMP_ID);
+
+    } // end OccCmd::handleOccException()
+
+
+
+    // Build OCC command buffer in HOMER, notify OCC and wait for
+    // the response or timeout
+    errlHndl_t OccCmd::writeOccCmd()
+    {
+        errlHndl_t l_err = NULL;
+        if (G_debug_trace & DEBUG_TRACE_VERBOSE)
+        {
+            TMGT_INF("writeOccCmd() called");
+        }
+
+        // Write the command to HOMER
+        buildOccCmdBuffer();
+
+        // Notify OCC that command is available (via circular buffer)
+        const uint32_t l_bitsToSend = sizeof(occCircBufferCmd_t) * 8;
+        ecmdDataBufferBase l_circ_buffer(l_bitsToSend);
+        const occCircBufferCmd_t tmgtDataWriteAttention =
+        {
+            0x10,   // sender: HTMGT
+            0x01,   // command: Command Write Attention
+            {0, 0, 0, 0, 0, 0} // reserved
+        };
+        l_circ_buffer.insert((uint8_t*)&tmgtDataWriteAttention, 0,
+                             l_bitsToSend);
+        if (G_debug_trace & DEBUG_TRACE_VERBOSE)
+        {
+            TMGT_INF("writeOccCmd: Calling writeCircularBuffer()");
+        }
+        l_err = HBOCC::writeCircularBuffer(iv_Occ->target, l_circ_buffer);
+        if (NULL != l_err)
+        {
+            TMGT_ERR("writeOccCmd: Error writing to OCC Circular Buffer");
+        }
+        else
+        {
+            // Wait for response from the OCC
+            const uint8_t l_instance = iv_Occ->instance;
+            const uint8_t l_index = getCmdIndex(iv_OccCmd.cmdType);
+            // l_index should be valid since validation was done in sendOccCmd()
+            const uint16_t l_read_timeout = cv_occCommandTable[l_index].timeout;
+
+            // Wait for OCC to process command and send response
+            waitForOccRsp(l_read_timeout);
+
+            // Parse the OCC response (called even on timeout to collect
+            // rsp buffer)
+            l_err = parseOccResponse();
+
+            bool l_timeout = false;
+            if (OCC_COMMAND_IN_PROGRESS != iv_OccRsp.returnStatus)
+            {
+                // Status of 0xE0-EF are reserved for OCC exceptions,
+                // must collect data for these
+                if (0xE0 == (iv_OccRsp.returnStatus & 0xF0))
+                {
+                    handleOccException();
+                }
+                else
+                {
+                    if (iv_OccRsp.sequenceNumber !=
+                        iv_OccCmd.sequenceNumber)
+                    {
+                        // Sequence number mismatch
+                        TMGT_ERR("writeOccCmd: OCC%d sequence number mismatch"
+                                 " (from cmd: 0x%02X, rsp: 0x%02X)",
+                                 l_instance, iv_OccCmd.sequenceNumber,
+                                 iv_OccRsp.sequenceNumber);
+                        l_timeout = true;
+                    }
+                }
+            }
+            else
+            {
+                // OCC must not have completed processing the command before
+                // timeout
+                l_timeout = true;
+            }
+
+            if (l_timeout)
+            {
+                /*@
+                 * @errortype
+                 * @reasoncode HTMGT_RC_TIMEOUT
+                 * @moduleid HTMGT_MOD_WRITE_OCC_CMD
+                 * @userdata1[0-15] command
+                 * @userdata1[16-31] read timeout
+                 * @userdata2[0-15] response sequence number
+                 * @userdata2[16-31] response status
+                 * @devdesc Timeout waiting for OCC response
+                 */
+                bldErrLog(l_err, HTMGT_MOD_WRITE_OCC_CMD, HTMGT_RC_TIMEOUT,
+                          iv_OccCmd.cmdType, l_read_timeout,
+                          iv_OccRsp.sequenceNumber,
+                          iv_OccRsp.returnStatus,
+                          ERRORLOG::ERRL_SEV_INFORMATIONAL);
+
+                // The response buffer did not contain correct sequence number,
+                // or staus is still in progress save 1K rsp data
+                // TODO RTC 115922
+                //l_err->addUsrDtls(l_err, l_excp_length,
+                //                  OCCC_COMP_ID, 1 /*version*/, 0xF0 /*type*/);
+
+                // timeout waiting for response (no data to return)
+                iv_OccRsp.dataLength = 0;
+            } // end timeout
+        }
+
+        return l_err;
+
+    } /* end of OccCmd::writeOccCmd() */
+
+
+
+    // Copy OCC command into command buffer in HOMER
+    uint16_t OccCmd::buildOccCmdBuffer()
+    {
+        uint8_t * const cmdBuffer = iv_Occ->homer + HTMGT_OCC_CMD_ADDR;
+        uint16_t l_send_length = 0;
+
+        if (0 == ++iv_Occ->seqNumber)
+        {
+            // Do not use 0 for sequence number
+            ++iv_Occ->seqNumber;
+        }
+        iv_OccCmd.sequenceNumber = iv_Occ->seqNumber;
+        cmdBuffer[l_send_length++] = iv_OccCmd.sequenceNumber;
+        cmdBuffer[l_send_length++] = iv_OccCmd.cmdType;
+        cmdBuffer[l_send_length++] = (iv_OccCmd.dataLength >> 8) & 0xFF;
+        cmdBuffer[l_send_length++] = iv_OccCmd.dataLength & 0xFF;
+        memcpy(&cmdBuffer[l_send_length], iv_OccCmd.cmdData,
+               iv_OccCmd.dataLength);
+        l_send_length += iv_OccCmd.dataLength;
+
+        // Calculate checksum
+        iv_OccCmd.checksum = 0;
+        for (uint16_t l_index = 0; l_index < l_send_length; l_index++)
+        {
+            iv_OccCmd.checksum += cmdBuffer[l_index];
+        }
+        cmdBuffer[l_send_length++] = (iv_OccCmd.checksum >> 8) & 0xFF;
+        cmdBuffer[l_send_length++] = iv_OccCmd.checksum & 0xFF;
+
+        if (G_debug_trace & DEBUG_TRACE_OCCCMD)
+        {
+            // Trace the command
+            TMGT_BIN("buildOccCmdBuffer: OCC command",
+                     cmdBuffer, l_send_length);
+        }
+
+#ifdef SIMICS_TESTING
+        g_seq = iv_OccCmd.sequenceNumber;
+        g_cmd = iv_OccCmd.cmdType;
+#endif
+
+        // When the P8 processor writes to memory (such as the HOMER) there is
+        // no certainty that the writes happen in order or that they have
+        // actually completed by the time the instructions complete. 'sync'
+        // is a memory barrier to ensure the HOMER data has actually been made
+        // consistent with respect to memory, so that if the OCC were to read
+        // it they would see all of the data. Otherwise, there is potential
+        // for them to get stale or incomplete data.
+        sync();
+
+        return l_send_length;
+
+    } // end OccCmd::buildOccCmdBuffer()
+
+
+
+    // Copy response into object
+    errlHndl_t OccCmd::parseOccResponse()
+    {
+        errlHndl_t l_errlHndl = NULL;
+        uint16_t l_index = 0;
+        const uint8_t * const rspBuffer = iv_Occ->homer + HTMGT_OCC_RSP_ADDR;
+        const uint16_t rspLen = OCC_RSP_HDR_LENGTH + UINT16_GET(&rspBuffer[3]);
+
+        if ((NULL != rspBuffer) && (rspLen >= OCC_RSP_HDR_LENGTH))
+        {
+            iv_OccRsp.sequenceNumber = rspBuffer[l_index++];
+            iv_OccRsp.cmdType = (enum occCommandType)rspBuffer[l_index++];
+            iv_OccRsp.returnStatus = (occReturnCodes)rspBuffer[l_index++];
+
+            iv_OccRsp.dataLength = UINT16_GET(&rspBuffer[l_index]);
+            l_index += 2;
+            if (rspLen >= (iv_OccRsp.dataLength + OCC_RSP_HDR_LENGTH))
+            {
+                if (iv_OccRsp.dataLength > 0)
+                {
+                    if (iv_OccRsp.dataLength > OCC_MAX_DATA_LENGTH)
+                    {
+                        TMGT_ERR("parseOccResponse: truncating data (0x%04X)",
+                                 iv_OccRsp.dataLength);
+                        iv_OccRsp.dataLength = OCC_MAX_DATA_LENGTH;
+                    }
+                    memcpy(iv_OccRsp.rspData, &rspBuffer[l_index],
+                           iv_OccRsp.dataLength);
+                    l_index += iv_OccRsp.dataLength;
+                }
+                iv_OccRsp.checksum = UINT16_GET(&rspBuffer[l_index]);
+                l_index += 2;
+            }
+            else
+            {
+                // Log invalid read length (not enough data received)
+                /*@
+                 * @errortype
+                 * @reasoncode HTMGT_RC_SEND_FAIL
+                 * @moduleid HTMGT_MOD_PARSE_OCC_RSP
+                 * @userdata1[0-15] response length
+                 * @userdata1[16-31] response buffer[0-3]
+                 * @userdata2[0-15] response buffer[4-7]
+                 * @userdata2[16-31]
+                 * @devdesc Invalid response length received
+                 */
+                bldErrLog(l_errlHndl, HTMGT_MOD_PARSE_OCC_RSP,
+                          HTMGT_RC_SEND_FAIL,
+                          rspLen, UINT32_GET(rspBuffer),
+                          UINT32_GET(&rspBuffer[4]), 0,
+                          ERRORLOG::ERRL_SEV_INFORMATIONAL);
+            }
+        }
+        else
+        {
+            uint32_t l_data[2] = {0};
+            if (NULL != rspBuffer)
+            {
+                memcpy(l_data, rspBuffer, sizeof(l_data));
+            }
+            // Log invalid read length (rsp too short)
+            bldErrLog(l_errlHndl, HTMGT_MOD_PARSE_OCC_RSP, HTMGT_RC_SEND_FAIL,
+                      rspLen, l_data[0], l_data[1], 0,
+                      ERRORLOG::ERRL_SEV_INFORMATIONAL);
+        }
+
+        if (l_errlHndl)
+        {
+            // Add full OCC response to user details
+            // TODO RTC 115922
+            //l_errlHndl->addUsrDtls(rspBuffer, rspLen, HTMGT_COMP_ID,
+            //                       0/*version*/, TMGT_OCC_RSP_DATA);
+        }
+
+        return l_errlHndl;
+
+    } // end OccCmd::parseOccResponse()
+
+
+
+    // Verify status, checksum and length of OCC response
+    errlHndl_t OccCmd::checkOccResponse()
+    {
+        errlHndl_t l_errlHndl = NULL;
+        uint16_t l_calc_checksum = 0, l_index = 0;
+
+        // Calculate checksum on response
+        l_calc_checksum += iv_OccRsp.sequenceNumber;
+        l_calc_checksum += iv_OccRsp.cmdType;
+        l_calc_checksum += iv_OccRsp.returnStatus;
+        l_calc_checksum += (iv_OccRsp.dataLength >> 8) & 0xFF;
+        l_calc_checksum += iv_OccRsp.dataLength & 0xFF;
+        for (l_index = 0; l_index < iv_OccRsp.dataLength; l_index++)
+        {
+            l_calc_checksum += iv_OccRsp.rspData[l_index];
+        }
+
+        if (l_calc_checksum == iv_OccRsp.checksum)
+        {
+            if (OCC_RC_SUCCESS == iv_OccRsp.returnStatus)
+            {
+                occCheckRspLengthType l_check_rsp_length;
+                uint16_t l_rsp_length = 0;
+
+                // Verify response length and log errors if bad
+                l_index = getCmdIndex(iv_OccRsp.cmdType);
+                // l_index should be valid since validation was done
+                // in sendOccCmd()
+                l_check_rsp_length = cv_occCommandTable[l_index].checkRspLength;
+                l_rsp_length = cv_occCommandTable[l_index].rspLength;
+
+                if (OCC_CHECK_RSP_LENGTH_EQUALS == l_check_rsp_length)
+                {
+                    if ( iv_OccRsp.dataLength != l_rsp_length )
+                    {
+                        TMGT_ERR("Invalid length in OCC response for"
+                                 " cmd=0x%02X, length=0x%04X",
+                                 iv_OccRsp.cmdType,
+                                 iv_OccRsp.dataLength);
+                        /*@
+                         * @errortype
+                         * @reasoncode HTMGT_RC_OCC_CMD_FAIL
+                         * @moduleid HTMGT_MOD_CHECK_OCC_RSP
+                         * @userdata1[0-15] OCC command type
+                         * @userdata1[16-31] response data length
+                         * @devdesc Invalid length in OCC response
+                         */
+                        bldErrLog(l_errlHndl, HTMGT_MOD_CHECK_OCC_RSP,
+                                  HTMGT_RC_OCC_CMD_FAIL,
+                                  iv_OccRsp.cmdType,
+                                  iv_OccRsp.dataLength, 0, 1,
+                                  ERRORLOG::ERRL_SEV_INFORMATIONAL);
+                    }
+                }
+                else if (OCC_CHECK_RSP_LENGTH_GREATER == l_check_rsp_length)
+                {
+                    if ( iv_OccRsp.dataLength < l_rsp_length )
+                    {
+                        TMGT_ERR("Invalid length in OCC response for"
+                                 " cmd=0x%02X, length=0x%04X",
+                                 iv_OccRsp.cmdType,
+                                 iv_OccRsp.dataLength);
+                        bldErrLog(l_errlHndl, HTMGT_MOD_CHECK_OCC_RSP,
+                                  HTMGT_RC_OCC_CMD_FAIL,
+                                  iv_OccRsp.cmdType,
+                                  iv_OccRsp.dataLength, 0, 2,
+                                  ERRORLOG::ERRL_SEV_INFORMATIONAL);
+                    }
+                }
+                else if (OCC_CHECK_RSP_LENGTH_NONE != l_check_rsp_length)
+                {
+                    TMGT_ERR("Invalid check response length=0x%02X in OCC"
+                             " command table for cmd = 0x%02X",
+                             l_check_rsp_length, iv_OccRsp.cmdType);
+                    bldErrLog(l_errlHndl, HTMGT_MOD_CHECK_OCC_RSP,
+                              HTMGT_RC_OCC_CMD_FAIL,
+                              iv_OccRsp.cmdType, iv_OccRsp.dataLength,
+                              0, 0, ERRORLOG::ERRL_SEV_INFORMATIONAL);
+                }
+            }
+            else
+            {
+                // Command was not successfully processed
+                uint8_t l_error_log_id = 0;
+
+                if (1 == iv_OccRsp.dataLength)
+                {
+                    // Data should be error log id created for this failure
+                    l_error_log_id = iv_OccRsp.rspData[0];
+
+                    TMGT_ERR("checkOccResponse: Bad status (0x%02X=%s) from OCC"
+                             " (returned elog=0x%02X)",
+                             iv_OccRsp.returnStatus,
+                             rsp_status_string(iv_OccRsp.returnStatus),
+                             l_error_log_id);
+                }
+                else
+                {
+                    TMGT_ERR("checkOccResponse: Bad status (0x%02X=%s) from OCC"
+                             " (data len=%d)",
+                             iv_OccRsp.returnStatus,
+                             rsp_status_string(iv_OccRsp.returnStatus),
+                             iv_OccRsp.dataLength);
+
+                    TMGT_ERR("OCC response packet length invalid (0x%04X)",
+                             iv_OccRsp.dataLength);
+                    l_error_log_id = 0;
+                }
+                /*  */
+                bldErrLog(l_errlHndl, HTMGT_MOD_CHECK_OCC_RSP,
+                          HTMGT_RC_OCC_CMD_FAIL,
+                          iv_OccRsp.returnStatus, l_error_log_id,
+                          iv_OccRsp.cmdType, 3,
+                          ERRORLOG::ERRL_SEV_INFORMATIONAL);
+            }
+        }
+        else
+        {
+            /*@
+             * @errortype
+             * @reasoncode HTMGT_RC_CHECKSUM_FAIL
+             * @moduleid HTMGT_MOD_CHECK_OCC_RSP
+             * @userdata1 OCC command type
+             * @userdata2 sequence number
+             * @userdata3 checksum
+             * @userdata4 calculated checksum
+             * @devdesc OCC response had checksum failure
+             */
+            bldErrLog(l_errlHndl, HTMGT_MOD_CHECK_OCC_RSP,
+                      HTMGT_RC_CHECKSUM_FAIL,
+                      iv_OccRsp.cmdType, iv_OccRsp.sequenceNumber,
+                      iv_OccRsp.checksum, l_calc_checksum,
+                      ERRORLOG::ERRL_SEV_INFORMATIONAL);
+        }
+
+        if (l_errlHndl)
+        {
+            // Add OCC response data to user details
+            // TODO RTC 115922
+            // l_errlHndl->addUsrDtls(iv_OccRsp.rspData,
+            //                        iv_OccRsp.dataLength, HTMGT_COMP_ID,
+            //                        0/*version*/, TMGT_OCC_RSP_DATA);
+        }
+
+        return(l_errlHndl);
+
+    } /* end of OccCmd::checkOccResponse() */
+
+
+}
+
diff --git a/src/usr/htmgt/htmgt_occcmd.H b/src/usr/htmgt/htmgt_occcmd.H
new file mode 100644
index 000000000..6bc5d75fc
--- /dev/null
+++ b/src/usr/htmgt/htmgt_occcmd.H
@@ -0,0 +1,304 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/htmgt/htmgt_occcmd.H $                                */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2014                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+
+#ifndef HTMGT_OCCCMD_H
+#define HTMGT_OCCCMD_H
+
+#include "htmgt_utility.H"
+#include "htmgt_activate.H"
+#include "htmgt_occ.H"
+
+#include <stdint.h>
+#include <errl/errlmanager.H>
+
+namespace HTMGT
+{
+
+    const uint32_t HTMGT_OCC_CMD_ADDR  = 0x001EE000;
+    const uint32_t HTMGT_OCC_RSP_ADDR  = 0x001EF000;
+    const uint32_t OCC_MAX_DATA_LENGTH = 0x00001000;
+
+    // The following header lengths include the 2 byte checksum
+    const uint16_t OCC_CMD_HDR_LENGTH = 6;
+    const uint16_t OCC_RSP_HDR_LENGTH = 7;
+
+    enum occReturnCodes
+    {
+        OCC_RC_SUCCESS                  = 0x00,
+        OCC_RC_INVALID_COMMAND          = 0x11,
+        OCC_RC_INVALID_COMMAND_LENGTH   = 0x12,
+        OCC_RC_INVALID_DATA_FIELD       = 0x13,
+        OCC_RC_CHECKSUM_FAILURE         = 0x14,
+        OCC_RC_INTERNAL_ERROR           = 0x15,
+        OCC_RC_PRESENT_STATE_PROHIBITS  = 0x16,
+
+        // 0xE0-EF are reserved for OCC exceptions on command timeouts
+        // TMGT should collect all the data in the response as FFDC
+        OCC_RC_OCC_EXCEPTION            = 0xE0,
+        OCC_RC_OCC_INIT_CHECKPOINT      = 0xE1,
+        OCC_RC_OCC_WATCHDOG_TIMEOUT     = 0xE2,
+        OCC_RC_OCC_TIMEOUT              = 0xE3,
+        OCC_RC_OCC_HW_ERROR             = 0xE4,
+        OCC_RC_OCC_EXCEPTION_RESERVED   = 0xEF,
+
+        OCC_COMMAND_IN_PROGRESS         = 0xFF
+    };
+
+    enum occCommandType
+    {
+        OCC_CMD_POLL                    = 0x00,
+        OCC_CMD_CLEAR_ERROR_LOG         = 0x12,
+        OCC_CMD_SET_STATE               = 0x20,
+        OCC_CMD_SETUP_CFG_DATA          = 0x21,
+        OCC_CMD_SET_POWER_CAP           = 0x22,
+        OCC_CMD_RESET_PREP              = 0x25,
+        OCC_CMD_GET_FIELD_DEBUG_DATA    = 0x42,
+
+        OCC_CMD_END_OF_TABLE            = 0xFF
+    };
+
+    enum occCheckRspLengthType
+    {
+        OCC_CHECK_RSP_LENGTH_NONE    = 0x00,
+        OCC_CHECK_RSP_LENGTH_EQUALS  = 0x01,
+        OCC_CHECK_RSP_LENGTH_GREATER = 0x02,
+    };
+
+    enum occCmdTraceEnum
+    {
+        OCC_TRACE_NEVER          = 0x00,
+        OCC_TRACE_EXTENDED       = 0x01,
+        OCC_TRACE_CONDITIONAL    = 0x02,
+        OCC_TRACE_ALWAYS         = 0x03,
+    };
+
+    struct occCommandTable_t
+    {
+        occCommandType    cmdType;
+        uint8_t            supported;
+        occCheckRspLengthType checkRspLength;
+        uint16_t           rspLength;
+        uint32_t           timeout;
+        uint16_t           maxBytesRead;
+        occCmdTraceEnum   traceCmd;
+
+        bool operator== (const occCommandType i_cmd)
+        {
+            return (cmdType == i_cmd);
+        }
+    };
+
+    struct occCommandStruct_t
+    {
+        uint8_t          sequenceNumber;
+        occCommandType   cmdType;
+        uint16_t         dataLength;
+        uint8_t          cmdData[OCC_MAX_DATA_LENGTH];
+        uint16_t         checksum;
+    };
+
+    struct occResponseStruct_t
+    {
+        uint8_t          sequenceNumber;
+        occCommandType   cmdType;
+        occReturnCodes   returnStatus;
+        uint16_t         dataLength;
+        uint8_t          rspData[OCC_MAX_DATA_LENGTH];
+        uint16_t         checksum;
+    };
+
+
+
+    /**
+     *  @class OccCmd
+     *
+     *  @brief OCC Command handling class.
+     *
+     *  @par Detailed Description:
+     *      Provides ability to build and send commands to the OCC and
+     *      process the responses returned by the OCC.
+     */
+    class OccCmd
+    {
+        private:
+            bool iv_RetryCmd;
+            occCommandStruct_t  iv_OccCmd;
+            occResponseStruct_t iv_OccRsp;
+            Occ * iv_Occ;
+
+            static const occCommandTable_t cv_occCommandTable[];
+
+            /**
+             * @brief Get the index of the specified command in the command
+             *        table
+             *
+             * @param[in] i_cmd  OCC command type
+             *
+             * @note If command not found/invalid, index to END_OF_TABLE will
+             *       be returned and checked by caller
+             *
+             * @return index into command table
+             */
+            uint8_t getCmdIndex(const occCommandType i_cmd);
+
+            /**
+             * @brief Write the full OCC command into HOMER (memory) including
+             *        checksum.
+             */
+            uint16_t buildOccCmdBuffer();
+
+            /**
+             * @brief Verify the status, checksum and length of the OCC
+             *        response.
+             *
+             * @return NULL on success, or errlHndl_t for any failure
+             */
+            errlHndl_t checkOccResponse();
+
+            /**
+             * @brief Parse the OCC response into the object and verify
+             *        lengths are valid.
+             *
+             * @return NULL on success, or errlHndl_t for any failure
+             */
+            errlHndl_t parseOccResponse();
+
+            /**
+             * @brief Create and commit error log from the exception data
+             *        in the response buffer.  It is assumed that the OCC
+             *        response status is 0xE0-0xEF when called.
+             */
+            void handleOccException(void);
+
+            /**
+             * @brief Send the command to the OCC
+             *
+             * @return NULL on success, or errlHndl_t for any failure
+             */
+            errlHndl_t writeOccCmd();
+
+            /**
+             * @brief Waits for the OCC response to be received
+             *
+             * @param[in] i_timeout  max time to wait for response (in seconds)
+             *
+             * @return true if timeout was reached before good response, or
+             *         false if response was received within the timeout
+             */
+            bool waitForOccRsp(uint32_t i_timeout);
+
+
+        public:
+            /**
+             * @brief Constructor
+             *
+             * @param[in] i_occ  target OCC for the command
+             * @param[in] i_cmd  OCC command to send
+             * @param[in] i_dataLength  Size of Data buffer (i_data)
+             * @param[in] i_data        Data buffer to send with command
+             */
+            OccCmd(Occ * i_occ,
+                   const occCommandType i_cmd,
+                   const uint16_t i_dataLength,
+                   const uint8_t *i_data);
+
+            /**
+             * @brief Destructor
+             */
+            ~OccCmd();
+
+            /**
+             * @brief Send this command to the OCC
+             *
+             * @return NULL on success, or errlHndl_t for any failure
+             */
+            errlHndl_t sendOccCmd();
+
+            /**
+             * @brief Determine if the command needs to be traced and trace it
+             *
+             * @return true if the command was traced
+             */
+            bool traceCommand();
+
+            /**
+             * @brief Trace the response
+             */
+            void traceResponse();
+
+            /**
+             * @brief Process the OCC response and determine if a retry
+             *        is necessary (iv_retryCmd will be true if required)
+             *
+             * @param[in,out] io_errlHndl Error handle from sending command
+             *                and response error handle if failed
+             * @param[in]     i_traceRsp  true if the response should be traced
+             */
+            void processOccResponse(errlHndl_t & io_errlHndl,
+                                    const bool i_traceRsp);
+            /**
+             * @brief Return the OCC response status from the response buffer
+             *
+             * @return OCC response status
+             */
+            occReturnCodes getRspStatus() { return iv_OccRsp.returnStatus; }
+
+            /**
+             * @brief Return the data length from the OCC response
+             *
+             * @return OCC response data length
+             */
+            uint16_t getRspLength() { return iv_OccRsp.dataLength; }
+
+            /**
+             * @brief Return a pointer to the response data and length
+             *
+             * @param[in,out] rsp_data  pointer to the response data
+             *
+             * @return OCC response data length
+             */
+            uint16_t getResponseData(uint8_t* & rsp_data)
+            {
+                rsp_data = iv_OccRsp.rspData;
+                return iv_OccRsp.dataLength;
+            }
+
+
+#ifdef SIMICS_TESTING
+            /**
+             * @brief Auto-responder for testing in simics
+             *
+             * @param[in] iOcc  OCC target
+             */
+            void fakeOccResponse();
+#endif
+
+    };
+
+
+
+} // end namespace
+
+#endif
diff --git a/src/usr/htmgt/htmgt_poll.C b/src/usr/htmgt/htmgt_poll.C
new file mode 100644
index 000000000..402c7ce74
--- /dev/null
+++ b/src/usr/htmgt/htmgt_poll.C
@@ -0,0 +1,141 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/htmgt/htmgt_poll.C $                                  */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2014                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+
+#include <htmgt/htmgt.H>
+#include <htmgt/htmgt_reasoncodes.H>
+#include "htmgt_utility.H"
+#include "htmgt_activate.H"
+#include "htmgt_poll.H"
+#include "htmgt_occcmd.H"
+#include "htmgt_config.H"
+
+//  Targeting support
+#include <targeting/common/commontargeting.H>
+#include <targeting/common/utilFilter.H>
+#include <targeting/common/attributes.H>
+#include <targeting/common/targetservice.H>
+
+
+using namespace HTMGT;
+
+
+namespace HTMGT
+{
+
+    // Send a single poll command to OCC
+    errlHndl_t sendOccPoll()
+    {
+        errlHndl_t l_err = NULL;
+        uint8_t * l_poll_rsp = NULL;
+
+        // Loop through all functional OCCs
+        std::vector<Occ*> occList = occMgr::instance().getOccArray();
+        for (std::vector<Occ*>::iterator itr = occList.begin();
+             (itr < occList.end()) && (NULL == l_err);
+             ++itr)
+        {
+            Occ * occ = (*itr);
+            const uint8_t occInstance = occ->getInstance();
+            TMGT_INF("sendOccPoll: to OCC%d", occInstance);
+
+            // create 1 byte buffer for poll command data
+            const uint8_t l_cmdData[1] = { 0x10 /*version*/ };
+
+            OccCmd cmd(occ, OCC_CMD_POLL, sizeof(l_cmdData), l_cmdData);
+            l_err = cmd.sendOccCmd();
+            if (l_err != NULL)
+            {
+                // Poll failed
+                TMGT_ERR("sendOccPoll: OCC%d poll failed with rc=0x%04X",
+                         occInstance, l_err->reasonCode());
+            }
+            else
+            {
+                // Poll succeeded, check response
+                uint32_t l_poll_rsp_size = cmd.getResponseData(l_poll_rsp);
+                if (l_poll_rsp_size >= OCC_POLL_DATA_MIN_SIZE)
+                {
+                    poll_rsp_handler(occ, l_poll_rsp, l_poll_rsp_size);
+                }
+                else
+                {
+                    TMGT_ERR("sendOccPoll: OCC%d poll command response "
+                             "failed with invalid data length %d",
+                             occInstance, l_poll_rsp_size);
+                    /*@
+                     * @errortype
+                     * @reasoncode HTMGT_RC_INVALID_LENGTH
+                     * @moduleid  HTMGT_MOD_OCC_POLL
+                     * @userdata1 OCC instance
+                     * @devdesc Invalid POLL response length
+                     */
+                    bldErrLog(l_err, HTMGT_MOD_OCC_POLL,
+                              HTMGT_RC_INVALID_LENGTH,
+                              occInstance, 0, 0, 0,
+                              ERRORLOG::ERRL_SEV_INFORMATIONAL);
+                }
+            }
+        }
+
+        return l_err;
+
+    } // end sendOccPoll()
+
+
+
+    // Handle OCC poll response
+    void poll_rsp_handler(Occ * i_occ,
+                          const uint8_t * i_pollResponse,
+                          const uint16_t i_pollResponseSize)
+    {
+        TMGT_DBG("OCC Poll Response", i_pollResponse, i_pollResponseSize);
+
+        const occPollRspStruct_t *pollRspData =
+            (occPollRspStruct_t *) i_pollResponse;
+
+        // Trace if any data changed
+        if (memcmp(pollRspData,
+                   i_occ->getLastPollRsp(),
+                   OCC_POLL_DATA_MIN_SIZE) != 0)
+        {
+            TMGT_INF("OCC%d Poll change: Status:%04X Occs:%02X Cfg:%02X "
+                     "State:%02X Error:%06X/%08X",
+                     i_occ->getInstance(),
+                     (pollRspData->status << 8) | pollRspData->extStatus,
+                     pollRspData->occsPresent,
+                     pollRspData->requestedCfg, pollRspData->state,
+                     (pollRspData->errorId<<16) | pollRspData->errorLength,
+                     pollRspData->errorAddress);
+            TMGT_INF("                  Code: \"%s\", NumSensors: 0x%02X",
+                     pollRspData->codeLevel, pollRspData->numBlocks);
+        }
+    }
+
+
+
+} // end namespace
+
+
+
diff --git a/src/usr/htmgt/htmgt_poll.H b/src/usr/htmgt/htmgt_poll.H
new file mode 100644
index 000000000..62eabf885
--- /dev/null
+++ b/src/usr/htmgt/htmgt_poll.H
@@ -0,0 +1,78 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/htmgt/htmgt_poll.H $                                  */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2014                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+
+#ifndef HTMGT_POLL_H
+#define HTMGT_POLL_H
+
+#include <stdint.h>
+#include <htmgt/htmgt.H>
+#include "htmgt_activate.H"
+#include "htmgt_occ.H"
+
+namespace HTMGT
+{
+    struct occPollRspStruct_t
+    {
+        uint8_t   status;
+        uint8_t   extStatus;
+        uint8_t   occsPresent;
+        uint8_t   requestedCfg;
+        uint8_t   state;
+        uint16_t  reserved;
+        uint8_t   errorId;
+        uint32_t  errorAddress;
+        uint16_t  errorLength;
+        uint16_t  reserved2;
+        uint8_t   codeLevel[16];
+        uint8_t   sensor[6];
+        uint8_t   numBlocks;
+        uint8_t   version;
+        uint8_t   sensorData[4049];
+    }  __attribute__((packed));
+
+    const uint32_t HTMGT_OCC_POLL_DATA_SIZE = sizeof(occPollRspStruct_t);
+
+
+    /**
+     * @brief Send a poll command to each OCC
+     *
+     * @return NULL on success, else error handle
+     */
+    errlHndl_t sendOccPoll();
+
+
+    /**
+     * @brief Handle OCC poll response
+     *
+     * @param[in] i_occ               pointer to the OCC
+     * @param[in] i_pollResponse      pointer to the response
+     * @param[in] i_pollResponseSize  length of the poll response
+     */
+    void poll_rsp_handler(Occ * i_occ,
+                          const uint8_t * i_pollResponse,
+                          const uint16_t i_pollResponseSize);
+
+} // end namespace
+#endif
diff --git a/src/usr/htmgt/htmgt_utility.C b/src/usr/htmgt/htmgt_utility.C
index 078c7eebd..733887de3 100644
--- a/src/usr/htmgt/htmgt_utility.C
+++ b/src/usr/htmgt/htmgt_utility.C
@@ -29,7 +29,12 @@ namespace HTMGT
 {
     // Trace definition
     trace_desc_t* g_trac_htmgt = NULL;
-    TRAC_INIT(&g_trac_htmgt, HTMGT_COMP_NAME, 2*KILOBYTE);
+    TRAC_INIT(&g_trac_htmgt, HTMGT_COMP_NAME, 4*KILOBYTE);
+
+    // Debug flags
+    uint32_t G_debug_data = 0;
+    uint32_t G_debug_trace = DEBUG_TRACE_FULL_NONVERBOSE; // TODO RTC 115922
+
 
     // Create/Build an Error log and add HTMGT component trace
     void bldErrLog(errlHndl_t &   io_err,
@@ -39,21 +44,25 @@ namespace HTMGT
                    const uint32_t i_data2,
                    const uint32_t i_data3,
                    const uint32_t i_data4,
-                   const ERRORLOG::errlSeverity_t i_sev)
+                   const ERRORLOG::errlSeverity_t i_sev,
+                   const bool i_addFwCallout)
     {
-        TMGT_INF("bldErrLog(mod: 0x%02X, rc: 0x%02X, data: 0x%08X %08X %08X %08X, sev: 0x%02X",
-                 i_modid, i_rc, i_data1, i_data2, i_data3, i_data4, i_sev);
+        TMGT_INF("bldErrLog(mod: 0x%02X, rc: 0x%02X, data: 0x%08X %08X %08X"
+                 " %08X, sev: 0x%02X, fw:%c",
+                 i_modid, i_rc, i_data1, i_data2, i_data3, i_data4,
+                 i_sev, i_addFwCallout?'y':'n');
+        // TODO RTC 109224 - RAS review what logs need fw callout
 
         if (NULL == io_err)
         {
-            io_err = new ERRORLOG::ErrlEntry
-                (i_sev,
-                 i_modid,
-                 i_rc,
-                 ((uint64_t)i_data1 << 32) | i_data2,
-                 ((uint64_t)i_data3 << 32) | i_data4,
-                 true /*Add HB Software Callout TODO RTC 115422 RAS review*/);
-
+            io_err = new ERRORLOG::ErrlEntry(i_sev,
+                                             i_modid,
+                                             i_rc,
+                                             ((uint64_t)i_data1 << 32) |
+                                             i_data2,
+                                             ((uint64_t)i_data3 << 32) |
+                                             i_data4,
+                                             i_addFwCallout);
             io_err->collectTrace("HTMGT");
         }
         else
@@ -62,4 +71,50 @@ namespace HTMGT
         }
     }
 
+
+
+    // Internal utility to convert OCC command type to a string
+    const char *command_string(const uint8_t i_cmd)
+    {
+        struct string_data_t
+        {
+            uint8_t       str_num;
+            const char    *str_data;
+        };
+
+        const static struct string_data_t L_cmd_string[] = {
+            {OCC_CMD_POLL, "POLL"},
+            {OCC_CMD_CLEAR_ERROR_LOG, "CLEAR_ELOG"},
+            {OCC_CMD_SET_STATE, "SET_STATE"},
+            {OCC_CMD_SETUP_CFG_DATA, "SET_CFG_DATA"},
+            {OCC_CMD_RESET_PREP, "RESET_PREP"},
+            {OCC_CMD_GET_FIELD_DEBUG_DATA, "GET_FIELD_DEBUG_DATA"},
+            // OCC_CMD_END_OF_TABLE should be the last entry
+            {OCC_CMD_END_OF_TABLE, "Unknown Command"}
+        };
+        const uint8_t l_total =
+            sizeof(L_cmd_string) / sizeof(struct string_data_t);
+
+        // TODO RTC 109066
+        uint8_t l_idx = 0;
+        for (l_idx=0; l_idx<l_total; l_idx++)
+        {
+            if (i_cmd == L_cmd_string[l_idx].str_num)
+            {
+                // Return Code found
+                break;
+            }
+        }
+
+        if (l_total == l_idx)
+        {
+            // Set index to last entry record
+            l_idx = l_total - 1;
+        }
+
+        return L_cmd_string[l_idx].str_data;
+    } // end command_string()
+
+
+
 } // end namespace
diff --git a/src/usr/htmgt/htmgt_utility.H b/src/usr/htmgt/htmgt_utility.H
index 5ff06d0b0..cbc5b1fb9 100644
--- a/src/usr/htmgt/htmgt_utility.H
+++ b/src/usr/htmgt/htmgt_utility.H
@@ -28,6 +28,7 @@
 #include <stdint.h>
 #include <trace/interface.H>
 #include <errl/errlmanager.H>
+#include "htmgt_occcmd.H"
 
 
 #define    TMGT_DBG( _fmt_, _args_...) \
@@ -78,7 +79,54 @@ namespace HTMGT
     // Trace definition
     extern trace_desc_t* g_trac_htmgt;
 
-    // Create/Build an Error log and add HTMGT component trace
+    // Debug flags
+    extern uint32_t G_debug_data;
+    enum debugTraceTypes
+    {
+        // Types are bit flags so can enable multiple at once
+        DEBUG_TRACE_OFF             = 0x00,
+        DEBUG_TRACE_OCCCMD          = 0x01, // OCC command tracing
+        DEBUG_TRACE_OCCCMD_FULL     = 0x02, // full OCC command tracing
+        DEBUG_TRACE_FULL_NONVERBOSE = 0x7FFFFFFF,
+        DEBUG_TRACE_VERBOSE         = 0x80000000, // verbose tracing
+        DEBUG_TRACE_FULL            = 0xFFFFFFFF
+    };
+    extern uint32_t G_debug_trace;
+
+
+    enum tmgtElogSubsecTypes
+    {
+        // Values selected to be common with FSP from tmgt_elog_parser.H
+        //SUBSEC_MSG_DATA_TYPE          = 0x01,
+        //SUBSEC_ERROR_DATA_TYPE        = 0x06,
+        //SUBSEC_ENERGYSCALE_DATA_TYPE  = 0x08,
+        //SUBSEC_OCC_ELOG_DATA_TYPE     = 0x0A,
+        //SUBSEC_OCC_FFDC_DATA_TYPE     = 0x0B,
+        //SUBSEC_MSG_DATA_TRUNCATED     = 0x0C,
+        SUBSEC_OCC_CMD_DATA           = 0x0D,
+        SUBSEC_OCC_RSP_DATA           = 0x0E,
+        //SUBSEC_ELOG_TYPE_TOIF_RESET   = 0x10,
+        //SUBSEC_ELOG_TYPE_OCC_RESET    = 0x11,
+        //SUBSEC_ELOG_TYPE_PCAP_DATA    = 0x12,
+        //SUBSEC_ELOG_TYPE_THERMAL_DATA = 0x13,
+        //SUBSEC_PROC_SCOM_REGISTERS    = 0x14,
+        // 0xE0-0xEF are reserved for OCC Exceptions
+    };
+
+
+    /**
+     * @brief Create/Build an Error log and add HTMGT component trace
+     *
+     * @param[in,out] io_err    Error handle to use or NULL to create new handle
+     * @param[in]     i_modid   Module ID
+     * @param[in]     i_rc      Return Code
+     * @param[in]     i_data1   User data word 1
+     * @param[in]     i_data2   User data word 2
+     * @param[in]     i_data3   User data word 3
+     * @param[in]     i_data4   User data word 4
+     * @param[in]     i_sev     Error severity
+     * @param[in]     i_addFwCallout  true if a FW Callout should be added
+     */
     void     bldErrLog(errlHndl_t &   io_err,
                        const uint8_t  i_modid,
                        const uint16_t i_rc,
@@ -86,8 +134,19 @@ namespace HTMGT
                        const uint32_t i_data2 = 0,
                        const uint32_t i_data3 = 0,
                        const uint32_t i_data4 = 0,
-                       const ERRORLOG::errlSeverity_t i_sev = ERRORLOG::ERRL_SEV_INFORMATIONAL);
-
+                       const ERRORLOG::errlSeverity_t i_sev =
+                       ERRORLOG::ERRL_SEV_INFORMATIONAL,
+                       const bool i_addFwCallout = false);
+
+
+    /**
+     * @brief Internal utility to convert OCC command type to a string
+     *
+     * @param[in]  i_cmd  OCC command type
+     *
+     * @return text string description of command
+     */
+    const char *command_string(const uint8_t i_cmd);
 
 
 } // end namespace
diff --git a/src/usr/htmgt/test/htmgt_occcmd_test.H b/src/usr/htmgt/test/htmgt_occcmd_test.H
new file mode 100644
index 000000000..eb92fac32
--- /dev/null
+++ b/src/usr/htmgt/test/htmgt_occcmd_test.H
@@ -0,0 +1,335 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/htmgt/test/htmgt_occcmd_test.H $                      */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2014                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+
+#ifndef __HTMGT_OCCCMD_TEST_H
+#define __HTMGT_OCCCMD_TEST_H
+
+#include <cxxtest/TestSuite.H>
+#include <errl/errlentry.H>
+#include <errl/errlmanager.H>
+#include <vfs/vfs.H>
+
+#include <htmgt/htmgt.H>
+
+#include <targeting/common/targetservice.H>
+#include <targeting/common/attributes.H>
+#include <targeting/common/commontargeting.H>
+#include <targeting/common/utilFilter.H>
+#include <targeting/common/util.H>
+
+#include <htmgt_activate.H>
+#include <htmgt_occcmd.H>
+
+
+using namespace TARGETING;
+
+
+class htmgtOccCmdTest: public CxxTest::TestSuite
+{
+    public:
+
+        // TODO RTC 118875
+        void test_occcmd_poll(void)
+        {
+            errlHndl_t l_err = NULL;
+            bool locallyLoaded = false;
+            TS_TRACE("entered test_occcmd_poll");
+
+            if(!VFS::module_is_loaded("libhtmgt.so"))
+            {
+                l_err = VFS::module_load("libhtmgt.so");
+                if( l_err )
+                {
+                    TS_FAIL("Could not load libhtmgt.so module");
+                    errlCommit(l_err,HTMGT_COMP_ID);
+                }
+                else
+                {
+                    locallyLoaded = true;
+                }
+            }
+
+            HTMGT::occMgr::instance().buildOccs();
+            if (HTMGT::occMgr::instance().getNumOccs() > 0)
+            {
+                HTMGT::Occ *l_occ =
+                    HTMGT::occMgr::instance().getMasterOcc();
+
+                // create 1 byte buffer for poll command data
+                const uint8_t l_cmdData[1] = { 0x10 /*version*/ };
+
+                // Normal Poll with default response
+                HTMGT::OccCmd l_cmd(l_occ, HTMGT::OCC_CMD_POLL,
+                                    sizeof(l_cmdData), l_cmdData);
+                l_err = l_cmd.sendOccCmd();
+                if (l_err != NULL)
+                {
+                    // Poll failed
+                    ERRORLOG::errlCommit(l_err, HTMGT_COMP_ID);
+                    TS_FAIL("occcmd_poll: Poll command failed" );
+                }
+                else
+                {
+                    // Poll succeeded
+                    uint8_t * l_poll_rsp = NULL;
+                    uint32_t l_poll_rsp_size =
+                        l_cmd.getResponseData(l_poll_rsp);
+                    TS_TRACE("test_occcmd_poll: length=%d, status=0x%02X",
+                             l_poll_rsp_size, l_cmd.getRspStatus());
+                }
+
+
+                // Timeout waiting for OCC to respond to Poll cmd
+                HTMGT::G_debug_data = 0x01;
+                HTMGT::OccCmd l_pollTimeout(l_occ, HTMGT::OCC_CMD_POLL,
+                                            sizeof(l_cmdData), l_cmdData);
+                l_err = l_pollTimeout.sendOccCmd();
+                if (l_err != NULL)
+                {
+                    // Poll failed
+                    if (0x2635 == l_err->reasonCode())
+                    {
+                        TS_TRACE("occcmd_poll: Poll timeout as expected");
+                    }
+                    else
+                    {
+                        TS_FAIL("occcmd_poll: Did not fail with 0x2635");
+                    }
+                    ERRORLOG::errlCommit(l_err, HTMGT_COMP_ID);
+                }
+                else
+                {
+                    // Poll succeeded
+                    uint8_t * l_poll_rsp = NULL;
+                    uint32_t l_poll_rsp_size =
+                        l_pollTimeout.getResponseData(l_poll_rsp);
+                    TS_TRACE("test_occcmd_poll: length=%d, status=0x%02X",
+                             l_poll_rsp_size,
+                             l_pollTimeout.getRspStatus());
+                    TS_FAIL("occcmd_poll: Poll should have failed due to"
+                            " timeout waiting for response");
+                }
+                HTMGT::G_debug_data = 0x00;
+
+
+                // Normal Poll with default response
+                HTMGT::OccCmd l_cmd2(l_occ, HTMGT::OCC_CMD_POLL,
+                                     sizeof(l_cmdData), l_cmdData);
+                l_err = l_cmd2.sendOccCmd();
+                if (l_err != NULL)
+                {
+                    // Poll failed
+                    ERRORLOG::errlCommit(l_err, HTMGT_COMP_ID);
+                    TS_FAIL("occcmd_poll: Poll 2 command failed" );
+                }
+                else
+                {
+                    // Poll succeeded
+                    uint8_t * l_poll_rsp = NULL;
+                    uint32_t l_poll_rsp_size =
+                        l_cmd2.getResponseData(l_poll_rsp);
+                    TS_TRACE("test_occcmd_poll: length=%d, status=0x%02X",
+                             l_poll_rsp_size, l_cmd2.getRspStatus());
+                }
+
+
+                // Timeout waiting for OCC to receive next command
+                HTMGT::G_debug_data = 0x02;
+                HTMGT::OccCmd l_pollTimeout2(l_occ, HTMGT::OCC_CMD_POLL,
+                                             sizeof(l_cmdData), l_cmdData);
+                l_err = l_pollTimeout2.sendOccCmd();
+                if (l_err != NULL)
+                {
+                    // Poll failed
+                    if (0x2635 == l_err->reasonCode())
+                    {
+                        TS_TRACE("occcmd_poll: Poll timeout as expected");
+                    }
+                    else
+                    {
+                        TS_FAIL("occcmd_poll: Did not fail with 0x2635");
+                    }
+                    ERRORLOG::errlCommit(l_err, HTMGT_COMP_ID);
+                }
+                else
+                {
+                    // Poll succeeded
+                    uint8_t * l_poll_rsp = NULL;
+                    uint32_t l_poll_rsp_size =
+                        l_pollTimeout2.getResponseData(l_poll_rsp);
+                    TS_TRACE("test_occcmd_poll: length=%d, status=0x%02X",
+                             l_poll_rsp_size,
+                             l_pollTimeout2.getRspStatus());
+                    TS_FAIL("occcmd_poll: Poll should have failed due to"
+                            " timeout waiting"
+                            " to receive cmd");
+                }
+                HTMGT::G_debug_data = 0x00;
+
+
+                // Normal Poll with default response
+                HTMGT::OccCmd l_cmd3(l_occ, HTMGT::OCC_CMD_POLL,
+                                     sizeof(l_cmdData), l_cmdData);
+                l_err = l_cmd3.sendOccCmd();
+                if (l_err != NULL)
+                {
+                    // Poll failed
+                    ERRORLOG::errlCommit(l_err, HTMGT_COMP_ID);
+                    TS_FAIL("occcmd_poll: Poll 3 command failed" );
+                }
+                else
+                {
+                    // Poll succeeded
+                    uint8_t * l_poll_rsp = NULL;
+                    uint32_t l_poll_rsp_size =
+                        l_cmd3.getResponseData(l_poll_rsp);
+                    TS_TRACE("test_occcmd_poll: length=%d, status=0x%02X",
+                             l_poll_rsp_size, l_cmd3.getRspStatus());
+                }
+
+
+                // Bad checkum in OCC response
+                HTMGT::G_debug_data = 0x03;
+                HTMGT::OccCmd l_pollChecsum(l_occ, HTMGT::OCC_CMD_POLL,
+                                            sizeof(l_cmdData), l_cmdData);
+                l_err = l_pollChecsum.sendOccCmd();
+                if (l_err != NULL)
+                {
+                    // Poll failed
+                    if (0x2619 == l_err->reasonCode())
+                    {
+                        TS_TRACE("occcmd_poll: Checksum fail as expected");
+                    }
+                    else
+                    {
+                        TS_FAIL("occcmd_poll: Did not fail with 0x2619");
+                    }
+                    ERRORLOG::errlCommit(l_err, HTMGT_COMP_ID);
+                }
+                else
+                {
+                    // Poll succeeded
+                    uint8_t * l_poll_rsp = NULL;
+                    uint32_t l_poll_rsp_size =
+                        l_pollChecsum.getResponseData(l_poll_rsp);
+                    TS_TRACE("test_occcmd_poll: length=%d, status=0x%02X",
+                             l_poll_rsp_size, l_pollChecsum.getRspStatus());
+                    TS_FAIL("occcmd_poll: Poll should have failed with a"
+                            " checksum failure" );
+                }
+                HTMGT::G_debug_data = 0x00;
+
+
+                // Normal Poll with default response
+                HTMGT::OccCmd l_cmd4(l_occ, HTMGT::OCC_CMD_POLL,
+                                     sizeof(l_cmdData), l_cmdData);
+                l_err = l_cmd4.sendOccCmd();
+                if (l_err != NULL)
+                {
+                    // Poll failed
+                    ERRORLOG::errlCommit(l_err, HTMGT_COMP_ID);
+                    TS_FAIL("occcmd_poll: Poll 4 command failed" );
+                }
+                else
+                {
+                    // Poll succeeded
+                    uint8_t * l_poll_rsp = NULL;
+                    uint32_t l_poll_rsp_size =
+                        l_cmd4.getResponseData(l_poll_rsp);
+                    TS_TRACE("test_occcmd_poll: length=%d, status=0x%02X",
+                             l_poll_rsp_size, l_cmd4.getRspStatus());
+                }
+
+
+                // OCC exception
+                HTMGT::G_debug_data = 0xE0;
+                HTMGT::OccCmd l_exception(l_occ, HTMGT::OCC_CMD_POLL,
+                                          sizeof(l_cmdData), l_cmdData);
+                l_err = l_exception.sendOccCmd();
+                if (l_err != NULL)
+                {
+                    // Poll failed
+                    if (0x2619 == l_err->reasonCode())
+                    {
+                        TS_TRACE("occcmd_poll: Checksum fail as expected");
+                    }
+                    else
+                    {
+                        TS_FAIL("occcmd_poll: Did not fail with 0x2619");
+                    }
+                    TS_TRACE("occcmd_poll: Check for 2AE0 exception logs");
+                    ERRORLOG::errlCommit(l_err, HTMGT_COMP_ID);
+                }
+                else
+                {
+                    // Poll succeeded
+                    uint8_t * l_poll_rsp = NULL;
+                    uint32_t l_poll_rsp_size =
+                        l_exception.getResponseData(l_poll_rsp);
+                    TS_TRACE("test_occcmd_poll: length=%d, status=0x%02X",
+                             l_poll_rsp_size, l_exception.getRspStatus());
+                    TS_FAIL("occcmd_poll: Poll should have failed with an"
+                            " OCC exception" );
+                }
+                HTMGT::G_debug_data = 0x00;
+
+
+                // Normal Poll with default response
+                HTMGT::OccCmd l_cmd5(l_occ, HTMGT::OCC_CMD_POLL,
+                                     sizeof(l_cmdData), l_cmdData);
+                l_err = l_cmd5.sendOccCmd();
+                if (l_err != NULL)
+                {
+                    // Poll failed
+                    ERRORLOG::errlCommit(l_err, HTMGT_COMP_ID);
+                    TS_FAIL("occcmd_poll: Poll 5 command failed" );
+                }
+                else
+                {
+                    // Poll succeeded
+                    uint8_t * l_poll_rsp = NULL;
+                    uint32_t l_poll_rsp_size =
+                        l_cmd5.getResponseData(l_poll_rsp);
+                    TS_TRACE("test_occcmd_poll: length=%d, status=0x%02X",
+                             l_poll_rsp_size, l_cmd5.getRspStatus());
+                }
+
+            }
+            else
+            {
+                TS_FAIL("occcmd_poll: Could not find any OCCs" );
+            }
+
+            if (locallyLoaded)
+            {
+                VFS::module_unload("libhtmgt.so");
+            }
+
+            TS_TRACE("exiting test_occcmd_poll");
+        }
+
+};
+
+#endif
diff --git a/src/usr/htmgt/test/htmgt_test.H b/src/usr/htmgt/test/htmgt_test.H
new file mode 100644
index 000000000..4cf7264c2
--- /dev/null
+++ b/src/usr/htmgt/test/htmgt_test.H
@@ -0,0 +1,225 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/htmgt/test/htmgt_test.H $                             */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2014                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+
+#ifndef __HTMGTTEST_H
+#define __HTMGTTEST_H
+
+#include <cxxtest/TestSuite.H>
+#include <errl/errlentry.H>
+#include <errl/errlmanager.H>
+#include <vfs/vfs.H>
+
+#include <htmgt/htmgt.H>
+#include <htmgt_activate.H>
+
+#include <targeting/common/targetservice.H>
+#include <targeting/common/attributes.H>
+#include <targeting/common/commontargeting.H>
+#include <targeting/common/utilFilter.H>
+#include <targeting/common/util.H>
+
+
+using namespace TARGETING;
+
+
+class htmgtTest: public CxxTest::TestSuite
+{
+    public:
+
+        // Check for HTMGT library
+        bool verifyModuleLoaded(const char *i_modname)
+        {
+            bool loadedLocally = false;
+
+            if(!VFS::module_is_loaded(i_modname))
+            {
+                errlHndl_t l_err = VFS::module_load(i_modname);
+                if( l_err )
+                {
+                    TS_FAIL("Could not load %s module", i_modname);
+                    errlCommit(l_err,HTMGT_COMP_ID);
+                }
+                else
+                {
+                    loadedLocally = true;
+                }
+            }
+
+            return loadedLocally;
+        }
+
+
+        // Get a target for the first OCC
+        TARGETING::TargetHandle_t getFirstOccTarget()
+        {
+            TARGETING::TargetHandle_t o_occTarget = NULL;
+
+            // Get all functional processors
+            TARGETING::TargetHandleList pProcs;
+            TARGETING::getChipResources(pProcs,
+                                        TARGETING::TYPE_PROC,
+                                        TARGETING::UTIL_FILTER_FUNCTIONAL);
+            if (pProcs.size() > 0)
+            {
+                const uint8_t instance =
+                    pProcs[0]->getAttr<TARGETING::ATTR_POSITION>();
+                TS_TRACE("buildOccs: PROC%d is functional", instance);
+
+                // Get functional OCC (one per proc)
+                TARGETING::TargetHandleList pOccs;
+                getChildChiplets(pOccs, pProcs[0], TARGETING::TYPE_OCC);
+                if (pOccs.size() > 0)
+                {
+                    // Use first OCC target
+                    TS_TRACE("getFirstOccTarget: Found OCC%d", instance);
+                    o_occTarget = pOccs[0];
+                }
+            }
+            if (NULL == o_occTarget)
+            {
+                TS_FAIL("getFirstOccTarget: did not find functional OCC");
+            }
+
+            return o_occTarget;
+        }
+
+
+        void test_occdataattr(void)
+        {
+            TS_TRACE("entered test_occdataattr");
+
+            uint8_t occControlData[256];
+            TargetHandleList procChips;
+            getAllChips(procChips, TYPE_PROC, true);
+            uint32_t index = 0;
+            for (TargetHandleList::iterator itr = procChips.begin();
+                 itr != procChips.end();
+                 ++itr)
+            {
+                const uint32_t *wordPtr = (uint32_t*)occControlData;
+                itr[index]->tryGetAttr<ATTR_OCC_CONTROL_DATA>(occControlData);
+                TS_TRACE("test_occdataattr[%d]: 0x%08X ...",
+                         index++, *wordPtr);
+                // TODO RTC 109066
+            }
+
+            TS_TRACE("exiting test_occdataattr");
+        }
+
+
+        void test_occloadstartfail(void)
+        {
+            TS_TRACE("entered test_occloadstartfail");
+            const bool locallyLoaded = verifyModuleLoaded("libhtmgt.so");
+
+            TARGETING::TargetHandle_t failedOcc = getFirstOccTarget();
+            HTMGT::processOccStartStatus(false, failedOcc);
+            if (HTMGT::occMgr::instance().getNumOccs() != 0)
+            {
+                TS_FAIL("occloadstartfail: No OCCs should be available");
+            }
+
+            if (locallyLoaded)
+            {
+                VFS::module_unload("libhtmgt.so");
+            }
+
+            TS_TRACE("exiting test_occloadstartfail");
+        }
+
+
+        void test_occloadstartsuccess(void)
+        {
+            TS_TRACE("entered test_occloadstartsuccess");
+            const bool locallyLoaded = verifyModuleLoaded("libhtmgt.so");
+
+            HTMGT::processOccStartStatus(true);
+            if (HTMGT::occMgr::instance().getNumOccs() == 0)
+            {
+                TS_FAIL("occloadstartsuccess: No OCCs are available");
+            }
+
+            if (locallyLoaded)
+            {
+                VFS::module_unload("libhtmgt.so");
+            }
+
+            TS_TRACE("exiting test_occloadstartsuccess");
+        }
+
+
+        void test_processoccerror(void)
+        {
+            TS_TRACE("entered test_processoccerror");
+            const bool locallyLoaded = verifyModuleLoaded("libhtmgt.so");
+
+                TARGETING::TargetHandle_t occTarget = getFirstOccTarget();
+                HTMGT::occMgr::instance().buildOccs();
+                if (HTMGT::occMgr::instance().getNumOccs() > 0)
+                {
+                    HTMGT::processOccError(occTarget);
+                    // TODO RTC 109224
+                }
+                else
+                {
+                    TS_FAIL("processoccerror: Couldnt find a functional OCC");
+                }
+
+            if (locallyLoaded)
+            {
+                VFS::module_unload("libhtmgt.so");
+            }
+
+            TS_TRACE("exiting test_processoccerror");
+        }
+
+        void test_processoccreset(void)
+        {
+            TS_TRACE("entered test_processoccreset");
+            const bool locallyLoaded = verifyModuleLoaded("libhtmgt.so");
+
+            TARGETING::TargetHandle_t occTarget = getFirstOccTarget();
+            HTMGT::occMgr::instance().buildOccs();
+            if (HTMGT::occMgr::instance().getNumOccs() > 0)
+            {
+                HTMGT::processOccReset(occTarget);
+                // TODO RTC 115296
+            }
+            else
+            {
+                TS_FAIL("processoccreset: Couldnt find a functional OCC");
+            }
+
+            if (locallyLoaded)
+            {
+                VFS::module_unload("libhtmgt.so");
+            }
+
+            TS_TRACE("exiting test_processoccreset");
+        }
+
+};
+
+#endif
diff --git a/src/usr/htmgt/test/makefile b/src/usr/htmgt/test/makefile
index a80ff55e2..cd03f5636 100644
--- a/src/usr/htmgt/test/makefile
+++ b/src/usr/htmgt/test/makefile
@@ -31,6 +31,7 @@ EXTRAINCDIR += ${ROOTPATH}/src/include/usr/hwpf/plat
 EXTRAINCDIR += ${ROOTPATH}/src/include/usr/hwpf/hwp
 EXTRAINCDIR += ${ROOTPATH}/src/usr/hwpf/hwp/include
 EXTRAINCDIR += ${ROOTPATH}/src/usr/hwpf/hwp/mc_config/mss_eff_config
+EXTRAINCDIR += ${ROOTPATH}/src/usr/htmgt
 
 MODULE = testhtmgt
 TESTS = *.H
diff --git a/src/usr/targeting/common/xmltohb/attribute_types_hb.xml b/src/usr/targeting/common/xmltohb/attribute_types_hb.xml
index 3e9925e2f..d519a9253 100644
--- a/src/usr/targeting/common/xmltohb/attribute_types_hb.xml
+++ b/src/usr/targeting/common/xmltohb/attribute_types_hb.xml
@@ -620,6 +620,19 @@
     <persistency>non-volatile</persistency>
     <readable/>
 </attribute>
+
+<attribute>
+    <id>OCC_CONTROL_DATA</id>
+    <description>OCC operational data
+    </description>
+    <simpleType>
+        <uint8_t></uint8_t>
+        <array>256</array>
+    </simpleType>
+    <persistency>volatile-zeroed</persistency>
+    <readable/>
+    <writeable/>
+</attribute>
 <!-- end HTMGT attributes -->
 
 <attribute>
diff --git a/src/usr/targeting/common/xmltohb/target_types_hb.xml b/src/usr/targeting/common/xmltohb/target_types_hb.xml
index f1291e5d7..dbbf1a167 100644
--- a/src/usr/targeting/common/xmltohb/target_types_hb.xml
+++ b/src/usr/targeting/common/xmltohb/target_types_hb.xml
@@ -61,6 +61,7 @@
     <attribute><id>OPEN_POWER_N_PLUS_ONE_BULK_POWER_LIMIT_WATTS</id></attribute>
     <attribute><id>OPEN_POWER_N_PLUS_ONE_MAX_MEM_POWER_WATTS</id></attribute>
     <attribute><id>OPEN_POWER_TURBO_MODE_SUPPORTED</id></attribute>
+    <attribute><id>OCC_CONTROL_DATA</id></attribute>
 </targetTypeExtension>
 
 <targetTypeExtension>