spl: add initial support for a generic SPL framework
Signed-off-by: Aneesh V <aneesh@ti.com> Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
This commit is contained in:
Daniel Schwierzeck
Wolfgang Denk
parent
4e0fbb98fc
commit
6a11cf48a5
39
README
39
README
@ -2255,6 +2255,45 @@ FIT uImage format:
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Adds the MTD partitioning infrastructure from the Linux
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kernel. Needed for UBI support.
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- SPL framework
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CONFIG_SPL
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Enable building of SPL globally.
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CONFIG_SPL_TEXT_BASE
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TEXT_BASE for linking the SPL binary.
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CONFIG_SPL_LDSCRIPT
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LDSCRIPT for linking the SPL binary.
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CONFIG_SPL_LIBCOMMON_SUPPORT
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Support for common/libcommon.o in SPL binary
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CONFIG_SPL_LIBDISK_SUPPORT
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Support for disk/libdisk.o in SPL binary
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CONFIG_SPL_I2C_SUPPORT
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Support for drivers/i2c/libi2c.o in SPL binary
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CONFIG_SPL_GPIO_SUPPORT
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Support for drivers/gpio/libgpio.o in SPL binary
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CONFIG_SPL_MMC_SUPPORT
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Support for drivers/mmc/libmmc.o in SPL binary
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CONFIG_SPL_SERIAL_SUPPORT
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Support for drivers/serial/libserial.o in SPL binary
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CONFIG_SPL_SPI_FLASH_SUPPORT
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Support for drivers/mtd/spi/libspi_flash.o in SPL binary
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CONFIG_SPL_SPI_SUPPORT
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Support for drivers/spi/libspi.o in SPL binary
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CONFIG_SPL_FAT_SUPPORT
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Support for fs/fat/libfat.o in SPL binary
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CONFIG_SPL_LIBGENERIC_SUPPORT
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Support for lib/libgeneric.o in SPL binary
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Modem Support:
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--------------
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62
doc/README.SPL
Normal file
62
doc/README.SPL
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@ -0,0 +1,62 @@
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Generic SPL framework
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=====================
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Overview
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--------
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To unify all existing implementations for a secondary program loader (SPL)
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and to allow simply adding of new implementations this generic SPL framework
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has been created. With this framework almost all source files for a board
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can be reused. No code duplication or symlinking is necessary anymore.
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How it works
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------------
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There is a new directory TOPDIR/spl which contains only a Makefile.
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The object files are built separately for SPL and placed in this directory.
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The final binaries which are generated are u-boot-spl, u-boot-spl.bin and
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u-boot-spl.map.
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During the SPL build a variable named CONFIG_SPL_BUILD is exported
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in the make environment and also appended to CPPFLAGS with -DCONFIG_SPL_BUILD.
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Source files can therefore be compiled for SPL with different settings.
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ARM-based boards have previously used the option CONFIG_PRELOADER for it.
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For example:
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ifeq ($(CONFIG_SPL_BUILD),y)
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COBJS-y += board_spl.o
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else
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COBJS-y += board.o
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endif
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COBJS-$(CONFIG_SPL_BUILD) += foo.o
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#ifdef CONFIG_SPL_BUILD
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foo();
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#endif
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The building of SPL images can be with:
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#define CONFIG_SPL
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Because SPL images normally have a different text base, one have to be
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configured by defining CONFIG_SPL_TEXT_BASE. The linker script have to be
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defined with CONFIG_SPL_LDSCRIPT.
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To support generic U-Boot libraries and drivers in the SPL binary one can
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optionally define CONFIG_SPL_XXX_SUPPORT. Currently following options
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are supported:
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CONFIG_SPL_LIBCOMMON_SUPPORT (common/libcommon.o)
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CONFIG_SPL_LIBDISK_SUPPORT (disk/libdisk.o)
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CONFIG_SPL_I2C_SUPPORT (drivers/i2c/libi2c.o)
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CONFIG_SPL_GPIO_SUPPORT (drivers/gpio/libgpio.o)
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CONFIG_SPL_MMC_SUPPORT (drivers/mmc/libmmc.o)
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CONFIG_SPL_SERIAL_SUPPORT (drivers/serial/libserial.o)
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CONFIG_SPL_SPI_FLASH_SUPPORT (drivers/mtd/spi/libspi_flash.o)
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CONFIG_SPL_SPI_SUPPORT (drivers/spi/libspi.o)
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CONFIG_SPL_FAT_SUPPORT (fs/fat/libfat.o)
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CONFIG_SPL_LIBGENERIC_SUPPORT (lib/libgeneric.o)
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4
spl/.gitignore
vendored
Normal file
4
spl/.gitignore
vendored
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@ -0,0 +1,4 @@
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u-boot-spl
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u-boot-spl.bin
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u-boot-spl.lds
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u-boot-spl.map
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100
spl/Makefile
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100
spl/Makefile
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#
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# (C) Copyright 2000-2011
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# (C) Copyright 2011
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# Daniel Schwierzeck, daniel.schwierzeck@googlemail.com.
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#
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# (C) Copyright 2011
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# Texas Instruments Incorporated - http://www.ti.com/
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# Aneesh V <aneesh@ti.com>
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#
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# This file is released under the terms of GPL v2 and any later version.
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# See the file COPYING in the root directory of the source tree for details.
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#
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# Based on top-level Makefile.
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#
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CONFIG_SPL_BUILD := y
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export CONFIG_SPL_BUILD
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include $(TOPDIR)/config.mk
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# We want the final binaries in this directory
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obj := $(OBJTREE)/spl/
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HAVE_VENDOR_COMMON_LIB := $(shell [ -f $(SRCTREE)/board/$(VENDOR)/common/Makefile ] \
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&& echo y || echo n)
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START := $(CPUDIR)/start.o
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LIBS-y += arch/$(ARCH)/lib/lib$(ARCH).o
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LIBS-y += $(CPUDIR)/lib$(CPU).o
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ifdef SOC
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LIBS-y += $(CPUDIR)/$(SOC)/lib$(SOC).o
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endif
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LIBS-y += board/$(BOARDDIR)/lib$(BOARD).o
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LIBS-$(HAVE_VENDOR_COMMON_LIB) += board/$(VENDOR)/common/lib$(VENDOR).o
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START := $(addprefix $(SPLTREE)/,$(START))
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LIBS := $(addprefix $(SPLTREE)/,$(sort $(LIBS-y)))
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__START := $(subst $(obj),,$(START))
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__LIBS := $(subst $(obj),,$(LIBS))
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# Linker Script
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ifdef CONFIG_SPL_LDSCRIPT
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# need to strip off double quotes
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LDSCRIPT := $(addprefix $(SRCTREE)/,$(subst ",,$(CONFIG_SPL_LDSCRIPT)))
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endif
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ifeq ($(wildcard $(LDSCRIPT)),)
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LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-spl.lds
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endif
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ifeq ($(wildcard $(LDSCRIPT)),)
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LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot-spl.lds
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endif
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ifeq ($(wildcard $(LDSCRIPT)),)
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$(error could not find linker script)
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endif
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# Special flags for CPP when processing the linker script.
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# Pass the version down so we can handle backwards compatibility
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# on the fly.
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LDPPFLAGS += \
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-include $(TOPDIR)/include/u-boot/u-boot.lds.h \
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-include $(OBJTREE)/include/config.h \
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$(shell $(LD) --version | \
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sed -ne 's/GNU ld version \([0-9][0-9]*\)\.\([0-9][0-9]*\).*/-DLD_MAJOR=\1 -DLD_MINOR=\2/p')
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ALL-y += $(obj)u-boot-spl.bin
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all: $(ALL-y)
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$(obj)u-boot-spl.bin: $(obj)u-boot-spl
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$(OBJCOPY) $(OBJCFLAGS) -O binary $< $@
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GEN_UBOOT = \
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UNDEF_SYM=`$(OBJDUMP) -x $(LIBS) | \
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sed -n -e 's/.*\($(SYM_PREFIX)__u_boot_cmd_.*\)/-u\1/p'|sort|uniq`;\
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cd $(obj) && $(LD) $(LDFLAGS) $(LDFLAGS_$(@F)) $$UNDEF_SYM $(__START) \
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--start-group $(__LIBS) --end-group $(PLATFORM_LIBS) \
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-Map u-boot-spl.map -o u-boot-spl
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$(obj)u-boot-spl: depend $(START) $(LIBS) $(obj)u-boot-spl.lds
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$(GEN_UBOOT)
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$(START): depend
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$(MAKE) -C $(SRCTREE)/$(CPUDIR) $@
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$(LIBS): depend
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$(MAKE) -C $(SRCTREE)$(dir $(subst $(SPLTREE),,$@))
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$(obj)u-boot-spl.lds: $(LDSCRIPT) depend
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$(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P - < $< > $@
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depend: $(obj).depend
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.PHONY: depend
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# defines $(obj).depend target
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include $(SRCTREE)/rules.mk
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