From: Haiying Wang Haiying.Wang@freescale.com
TPL is introduced to enable a loader stub that boots out of some type of RAM, after being loaded by an SPL or similar platform-specific mechanism.
One example of using this tpl loader is to initialize the ddr through spd code in case the L2 SRAM size is not big enough to hold the final uboot image and the nand spl code needs to be limitated to 4K byte, then tpl code will load the final uboot image after ddr is initialized.
Signed-off-by: Haiying Wang Haiying.Wang@freescale.com --- Makefile | 15 ++++++++++++++- README | 27 +++++++++++++++++++++++++++ 2 files changed, 41 insertions(+), 1 deletions(-)
diff --git a/Makefile b/Makefile index 0d1ea5d..ae5db69 100644 --- a/Makefile +++ b/Makefile @@ -402,8 +402,19 @@ $(obj)u-boot.lds: $(LDSCRIPT) nand_spl: $(TIMESTAMP_FILE) $(VERSION_FILE) $(obj)include/autoconf.mk $(MAKE) -C nand_spl/board/$(BOARDDIR) all
+tpl: $(TIMESTAMP_FILE) $(VERSION_FILE) depend + $(MAKE) -C tpl/board/$(BOARDDIR) all + +NAND_SPL_OBJS-y += $(obj)nand_spl/u-boot-spl-16k.bin +NAND_SPL_OBJS-$(CONFIG_HAS_TPL) += $(obj)tpl/u-boot-tpl.bin +NAND_SPL_OBJS-y += $(obj)u-boot.bin + +ifeq ($(CONFIG_HAS_TPL),y) +$(obj)u-boot-nand.bin: nand_spl tpl $(obj)u-boot.bin +else $(obj)u-boot-nand.bin: nand_spl $(obj)u-boot.bin - cat $(obj)nand_spl/u-boot-spl-16k.bin $(obj)u-boot.bin > $(obj)u-boot-nand.bin +endif + cat $(NAND_SPL_OBJS-y) > $(obj)u-boot-nand.bin
onenand_ipl: $(TIMESTAMP_FILE) $(VERSION_FILE) $(obj)include/autoconf.mk $(MAKE) -C onenand_ipl/board/$(BOARDDIR) all @@ -1221,6 +1232,7 @@ clean: @rm -f $(obj)lib/asm-offsets.s @rm -f $(obj)nand_spl/{u-boot.lds,u-boot-spl,u-boot-spl.map,System.map} @rm -f $(obj)onenand_ipl/onenand-{ipl,ipl.bin,ipl.map} + @rm -f $(obj)tpl/{u-boot-tpl,u-boot-tpl.map} @rm -f $(ONENAND_BIN) @rm -f $(obj)onenand_ipl/u-boot.lds @rm -f $(TIMESTAMP_FILE) $(VERSION_FILE) @@ -1245,6 +1257,7 @@ clobber: clean @rm -fr $(obj)include/generated @[ ! -d $(obj)nand_spl ] || find $(obj)nand_spl -name "*" -type l -print | xargs rm -f @[ ! -d $(obj)onenand_ipl ] || find $(obj)onenand_ipl -name "*" -type l -print | xargs rm -f + @[ ! -d $(obj)tpl ] || find $(obj)tpl -name "*" -type l -print | xargs rm -f
ifeq ($(OBJTREE),$(SRCTREE)) mrproper \ diff --git a/README b/README index 755d17c..447fff0 100644 --- a/README +++ b/README @@ -2124,6 +2124,33 @@ FIT uImage format: Adds the MTD partitioning infrastructure from the Linux kernel. Needed for UBI support.
+- NAND Boot Support + CONFIG_NAND_U_BOOT + + Builds a U-Boot image that boots from NAND, prefixed by a small + loader stub (secondary program loader -- SPL) that loads the + rest of U-Boot into RAM. This symbol will be set in all build + phases. + + CONFIG_NAND_SPL + + This is set by the build system when compiling code to go into + the SPL. It is not set when building the code that the SPL + loads. + +- TPL Boot Support + CONFIG_HAS_TPL + + Builds a U-Boot image that contains a loader stub (tertiary + program loader -- TPL) that boots out of some type of RAM, + after being loaded by an SPL or similar platform-specific + mechanism. This symbol will be set in all build phases. + + CONFIG_IN_TPL + + This is set by the build system when compiling code to go into + the TPL. It is not set when building the code that the TPL + loads, or when building the SPL.
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