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>
diff --git a/config.mk b/config.mk
index 54e99f4..b3ecaa7 100644
--- a/config.mk
+++ b/config.mk
@@ -13,6 +13,12 @@
export SHELL
+ifeq ($(CONFIG_TPL_BUILD),y)
+SPL_BIN := u-boot-tpl
+else
+SPL_BIN := u-boot-spl
+endif
+
ifeq ($(CURDIR),$(SRCTREE))
dir :=
else
@@ -22,7 +28,11 @@
ifneq ($(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 @@
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 $(obj))
else
obj :=
@@ -145,6 +159,10 @@
#########################################################################
# Load generated board configuration
+ifeq ($(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 @@
# Include normal autoconf
sinclude $(OBJTREE)/include/autoconf.mk
endif
+endif
sinclude $(OBJTREE)/include/config.mk
# Some architecture config.mk files need to know what CPUDIR is set to,
@@ -221,12 +240,19 @@
CPPFLAGS += -DCONFIG_SPL_PAD_TO=$(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 @@
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
