Compile Hostboot with -Os

Hostboot currently spends a significant percentage of
time loading data from PNOR across a relatively slow LPC
bus.  This commit enables compilation of Hostboot with
-Os, optimized for space to reduce the amount of data required
to be transferred across the LPC bus

Rough measurements show a ~30% size reduction of the hostboot
image and a ~10% reduction (improvement) in boot time

Change-Id: Ib140e6f07b112ae95a901f49b75416ef91c94a9d
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/79059
Reviewed-by: Nicholas E Bofferding <bofferdn@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Zachary Clark <zach@ibm.com>
Reviewed-by: Michael Baiocchi <mbaiocch@us.ibm.com>
Reviewed-by: William G Hoffa <wghoffa@us.ibm.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/build/linker/linker.C b/src/build/linker/linker.C
index e5e53ad8a..ba498d8a9 100644
--- a/src/build/linker/linker.C
+++ b/src/build/linker/linker.C
@@ -123,6 +123,7 @@ struct Object
         string name;                    //!< full path name of file
         bfd* image;                     //!< bfd image of object
         Section text;                   //!< text section of binary
+        Section sfpr;                   //!< sfpr section of binary
         Section rodata;                 //!< rodata section of binary
         Section data;                   //!< data section of binary
         map<string, Symbol> symbols;    //!< symbol map
@@ -594,6 +595,11 @@ bool Object::read_object(const char* i_file)
             {
                 s = &this->text;
             }
+            else if (string(".sfpr") ==
+                     bfd_get_section_name(image, image_section))
+            {
+                s = &this->sfpr;
+            }
             else if (string(".rodata") ==
                      bfd_get_section_name(image, image_section))
             {
@@ -648,6 +654,16 @@ bool Object::write_object()
             cout << strerror(error) << endl;
         }
 
+        // Output sfpr section.
+        fseek(iv_output, offset + sfpr.vma_offset, SEEK_SET);
+        if ((0 != sfpr.size) &&
+            (sfpr.size != fwrite(sfpr.data, 1, sfpr.size, iv_output)))
+        {
+            int error = errno;
+            cout << "Error writing to output for sfpr." << endl;
+            cout << strerror(error) << endl;
+        }
+
         // Output RODATA section.
         fseek(iv_output, offset + rodata.vma_offset, SEEK_SET);
         if ((0 != rodata.size) &&