[U-Boot] [PATCH v2 06/22] Add generic spl infrastructure

[Aneesh V]

Define a new type of SPL that is not tied to any particular media.
- Create a top level directory 'spl' that has a structure similar
  to the existing 'nand_spl'
- Make necessary changes to top-level Makefile to build such an spl

Rationale for this approach:
- There may be SPLs(like the OMAP x-loader) that support booting from
  multiple media.
- Also, there is no harm in keeping SPLs specific to a particular media
  also under this directory. In fact it makes sense to merge all the
  different spl directories into this one.

Signed-off-by: Aneesh V <aneesh at ti.com>
---
This patch generates 1 checkpatch warning due to declaration
of DECLARE_GLOBAL_DATA_PTR. This is un-avoidable
---
 Makefile                           |   24 ++++++++++++++++++++++++
 arch/arm/include/asm/global_data.h |    5 +++++
 2 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/Makefile b/Makefile
index 384a59e..d3f4bef 100644
--- a/Makefile
+++ b/Makefile
@@ -289,6 +289,22 @@ LDPPFLAGS += \
 	$(shell $(LD) --version | \
 	  sed -ne 's/GNU ld version \([0-9][0-9]*\)\.\([0-9][0-9]*\).*/-DLD_MAJOR=\1 -DLD_MINOR=\2/p')
 
+ifeq ($(CONFIG_NAND_U_BOOT),y)
+NAND_SPL = nand_spl
+U_BOOT_NAND = $(obj)u-boot-nand.bin
+endif
+
+ifeq ($(CONFIG_SPL),y)
+.PHONEY : SPL
+ALL += SPL
+endif
+
+ifeq ($(CONFIG_ONENAND_U_BOOT),y)
+ONENAND_IPL = onenand_ipl
+U_BOOT_ONENAND = $(obj)u-boot-onenand.bin
+ONENAND_BIN ?= $(obj)onenand_ipl/onenand-ipl-2k.bin
+endif
+
 __OBJS := $(subst $(obj),,$(OBJS))
 __LIBS := $(subst $(obj),,$(LIBS)) $(subst $(obj),,$(LIBBOARD))
 
@@ -402,8 +418,13 @@ $(obj)u-boot.lds: $(LDSCRIPT)
 		$(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P - <$^ >$@
 
 nand_spl:	$(TIMESTAMP_FILE) $(VERSION_FILE) depend
+
+$(NAND_SPL):	$(TIMESTAMP_FILE) $(VERSION_FILE) depend
 		$(MAKE) -C nand_spl/board/$(BOARDDIR) all
 
+SPL		:$(TIMESTAMP_FILE) $(VERSION_FILE) depend tools
+		$(MAKE) -C spl/board/$(BOARDDIR) all
+
 $(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
 
@@ -1122,6 +1143,7 @@ clean:
 	@rm -f $(obj)include/bmp_logo.h
 	@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)spl/{u-boot-spl-generated.lds,u-boot-spl,u-boot-spl.map}
 	@rm -f $(obj)onenand_ipl/onenand-{ipl,ipl.bin,ipl.map}
 	@rm -f $(ONENAND_BIN)
 	@rm -f $(obj)onenand_ipl/u-boot.lds
@@ -1141,12 +1163,14 @@ clobber:	clean
 	@rm -f $(obj)u-boot $(obj)u-boot.map $(obj)u-boot.hex $(ALL)
 	@rm -f $(obj)u-boot.kwb
 	@rm -f $(obj)u-boot.imx
+	@rm -f $(obj)MLO
 	@rm -f $(obj)tools/{env/crc32.c,inca-swap-bytes}
 	@rm -f $(obj)arch/powerpc/cpu/mpc824x/bedbug_603e.c
 	@rm -fr $(obj)include/asm/proc $(obj)include/asm/arch $(obj)include/asm
 	@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)spl ] || find $(obj)spl -name "*" -type l -print | xargs rm -f
 
 ifeq ($(OBJTREE),$(SRCTREE))
 mrproper \
diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h
index 2a84d27..2ce020e 100644
--- a/arch/arm/include/asm/global_data.h
+++ b/arch/arm/include/asm/global_data.h
@@ -89,6 +89,11 @@ typedef	struct	global_data {
 #define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)		*/
 #define GD_FLG_ENV_READY	0x00080	/* Environment imported into hash table	*/
 
+#ifdef CONFIG_PRELOADER
+/* SPL works from internal RAM. gd pointer can be in .data section */
+#define DECLARE_GLOBAL_DATA_PTR     extern gd_t *gd
+#else
 #define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("r8")
+#endif
 
 #endif /* __ASM_GBL_DATA_H */
-- 
1.7.0.4