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TPL : introduce the TPL based on the SPL

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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>
This commit is contained in:
Ying Zhang
2013-08-16 15:16:15 +08:00
committed by York Sun
parent 382ce7e909
commit 3aa29de0b0
5 changed files with 147 additions and 14 deletions
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30
config.mk
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@@ -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