From 3aa29de0b04be9d56251474d1036b23da249f607 Mon Sep 17 00:00:00 2001
From: Ying Zhang <b40530@freescale.com>
Date: Fri, 16 Aug 2013 15:16:15 +0800
Subject: TPL : introduce the TPL based on the SPL

Due to the nand SPL on some board(e.g. P1022DS)has a size limit, it can
not be more than 4K. So, the SPL cannot initialize the DDR with the SPD
code. This patch introduces TPL to enable a loader stub that is loaded
by the code from the SPL. It initializes the DDR with the SPD or other
operations.

The TPL's size is sizeable, the maximum size is decided by the memory's
size that TPL runs. It initializes the DDR through SPD code, and copys
final uboot image to DDR. So there are three stage uboot images:
	* spl_boot, * tpl_boot, * final uboot image

Signed-off-by: Ying Zhang <b40530@freescale.com>
Acked-by: York Sun <yorksun@freescale.com>
---
 config.mk | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

(limited to 'config.mk')

diff --git a/config.mk b/config.mk
index 54e99f4da3..b3ecaa7f80 100644
--- a/config.mk
+++ b/config.mk
@@ -13,6 +13,12 @@ SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 
 export	SHELL
 
+ifeq ($(CONFIG_TPL_BUILD),y)
+SPL_BIN := u-boot-tpl
+else
+SPL_BIN := u-boot-spl
+endif
+
 ifeq ($(CURDIR),$(SRCTREE))
 dir :=
 else
@@ -22,7 +28,11 @@ endif
 ifneq ($(OBJTREE),$(SRCTREE))
 # Create object files for SPL in a separate directory
 ifeq ($(CONFIG_SPL_BUILD),y)
+ifeq ($(CONFIG_TPL_BUILD),y)
+obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/)
+else
 obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
+endif
 else
 obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
 endif
@@ -32,8 +42,12 @@ $(shell mkdir -p $(obj))
 else
 # Create object files for SPL in a separate directory
 ifeq ($(CONFIG_SPL_BUILD),y)
+ifeq ($(CONFIG_TPL_BUILD),y)
+obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/)
+else
 obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
 
+endif
 $(shell mkdir -p $(obj))
 else
 obj :=
@@ -145,6 +159,10 @@ CHECK	= sparse
 #########################################################################
 
 # Load generated board configuration
+ifeq ($(CONFIG_TPL_BUILD),y)
+# Include TPL autoconf
+sinclude $(OBJTREE)/include/tpl-autoconf.mk
+else
 ifeq ($(CONFIG_SPL_BUILD),y)
 # Include SPL autoconf
 sinclude $(OBJTREE)/include/spl-autoconf.mk
@@ -152,6 +170,7 @@ else
 # Include normal autoconf
 sinclude $(OBJTREE)/include/autoconf.mk
 endif
+endif
 sinclude $(OBJTREE)/include/config.mk
 
 # Some architecture config.mk files need to know what CPUDIR is set to,
@@ -221,12 +240,19 @@ ifneq ($(CONFIG_SPL_PAD_TO),)
 CPPFLAGS += -DCONFIG_SPL_PAD_TO=$(CONFIG_SPL_PAD_TO)
 endif
 
+ifneq ($(CONFIG_TPL_PAD_TO),)
+CPPFLAGS += -DCONFIG_TPL_PAD_TO=$(CONFIG_TPL_PAD_TO)
+endif
+
 ifneq ($(CONFIG_UBOOT_PAD_TO),)
 CPPFLAGS += -DCONFIG_UBOOT_PAD_TO=$(CONFIG_UBOOT_PAD_TO)
 endif
 
 ifeq ($(CONFIG_SPL_BUILD),y)
 CPPFLAGS += -DCONFIG_SPL_BUILD
+ifeq ($(CONFIG_TPL_BUILD),y)
+CPPFLAGS += -DCONFIG_TPL_BUILD
+endif
 endif
 
 # Does this architecture support generic board init?
@@ -298,9 +324,9 @@ ifneq ($(CONFIG_SYS_TEXT_BASE),)
 LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
 endif
 
-LDFLAGS_u-boot-spl += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL)
+LDFLAGS_$(SPL_BIN) += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL)
 ifneq ($(CONFIG_SPL_TEXT_BASE),)
-LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE)
+LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE)
 endif
 
 # Linus' kernel sanity checking tool
-- 
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