Commit 6a11cf48 authored by Daniel Schwierzeck's avatar Daniel Schwierzeck Committed by Wolfgang Denk
Browse files

spl: add initial support for a generic SPL framework


Signed-off-by: default avatarAneesh V <aneesh@ti.com>
Signed-off-by: default avatarDaniel Schwierzeck <daniel.schwierzeck@googlemail.com>
parent 4e0fbb98
...@@ -2255,6 +2255,45 @@ FIT uImage format: ...@@ -2255,6 +2255,45 @@ FIT uImage format:
Adds the MTD partitioning infrastructure from the Linux Adds the MTD partitioning infrastructure from the Linux
kernel. Needed for UBI support. kernel. Needed for UBI support.
- SPL framework
CONFIG_SPL
Enable building of SPL globally.
CONFIG_SPL_TEXT_BASE
TEXT_BASE for linking the SPL binary.
CONFIG_SPL_LDSCRIPT
LDSCRIPT for linking the SPL binary.
CONFIG_SPL_LIBCOMMON_SUPPORT
Support for common/libcommon.o in SPL binary
CONFIG_SPL_LIBDISK_SUPPORT
Support for disk/libdisk.o in SPL binary
CONFIG_SPL_I2C_SUPPORT
Support for drivers/i2c/libi2c.o in SPL binary
CONFIG_SPL_GPIO_SUPPORT
Support for drivers/gpio/libgpio.o in SPL binary
CONFIG_SPL_MMC_SUPPORT
Support for drivers/mmc/libmmc.o in SPL binary
CONFIG_SPL_SERIAL_SUPPORT
Support for drivers/serial/libserial.o in SPL binary
CONFIG_SPL_SPI_FLASH_SUPPORT
Support for drivers/mtd/spi/libspi_flash.o in SPL binary
CONFIG_SPL_SPI_SUPPORT
Support for drivers/spi/libspi.o in SPL binary
CONFIG_SPL_FAT_SUPPORT
Support for fs/fat/libfat.o in SPL binary
CONFIG_SPL_LIBGENERIC_SUPPORT
Support for lib/libgeneric.o in SPL binary
Modem Support: Modem Support:
-------------- --------------
......
Generic SPL framework
=====================
Overview
--------
To unify all existing implementations for a secondary program loader (SPL)
and to allow simply adding of new implementations this generic SPL framework
has been created. With this framework almost all source files for a board
can be reused. No code duplication or symlinking is necessary anymore.
How it works
------------
There is a new directory TOPDIR/spl which contains only a Makefile.
The object files are built separately for SPL and placed in this directory.
The final binaries which are generated are u-boot-spl, u-boot-spl.bin and
u-boot-spl.map.
During the SPL build a variable named CONFIG_SPL_BUILD is exported
in the make environment and also appended to CPPFLAGS with -DCONFIG_SPL_BUILD.
Source files can therefore be compiled for SPL with different settings.
ARM-based boards have previously used the option CONFIG_PRELOADER for it.
For example:
ifeq ($(CONFIG_SPL_BUILD),y)
COBJS-y += board_spl.o
else
COBJS-y += board.o
endif
COBJS-$(CONFIG_SPL_BUILD) += foo.o
#ifdef CONFIG_SPL_BUILD
foo();
#endif
The building of SPL images can be with:
#define CONFIG_SPL
Because SPL images normally have a different text base, one have to be
configured by defining CONFIG_SPL_TEXT_BASE. The linker script have to be
defined with CONFIG_SPL_LDSCRIPT.
To support generic U-Boot libraries and drivers in the SPL binary one can
optionally define CONFIG_SPL_XXX_SUPPORT. Currently following options
are supported:
CONFIG_SPL_LIBCOMMON_SUPPORT (common/libcommon.o)
CONFIG_SPL_LIBDISK_SUPPORT (disk/libdisk.o)
CONFIG_SPL_I2C_SUPPORT (drivers/i2c/libi2c.o)
CONFIG_SPL_GPIO_SUPPORT (drivers/gpio/libgpio.o)
CONFIG_SPL_MMC_SUPPORT (drivers/mmc/libmmc.o)
CONFIG_SPL_SERIAL_SUPPORT (drivers/serial/libserial.o)
CONFIG_SPL_SPI_FLASH_SUPPORT (drivers/mtd/spi/libspi_flash.o)
CONFIG_SPL_SPI_SUPPORT (drivers/spi/libspi.o)
CONFIG_SPL_FAT_SUPPORT (fs/fat/libfat.o)
CONFIG_SPL_LIBGENERIC_SUPPORT (lib/libgeneric.o)
u-boot-spl
u-boot-spl.bin
u-boot-spl.lds
u-boot-spl.map
#
# (C) Copyright 2000-2011
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# (C) Copyright 2011
# Daniel Schwierzeck, daniel.schwierzeck@googlemail.com.
#
# (C) Copyright 2011
# Texas Instruments Incorporated - http://www.ti.com/
# Aneesh V <aneesh@ti.com>
#
# This file is released under the terms of GPL v2 and any later version.
# See the file COPYING in the root directory of the source tree for details.
#
# Based on top-level Makefile.
#
CONFIG_SPL_BUILD := y
export CONFIG_SPL_BUILD
include $(TOPDIR)/config.mk
# We want the final binaries in this directory
obj := $(OBJTREE)/spl/
HAVE_VENDOR_COMMON_LIB := $(shell [ -f $(SRCTREE)/board/$(VENDOR)/common/Makefile ] \
&& echo y || echo n)
START := $(CPUDIR)/start.o
LIBS-y += arch/$(ARCH)/lib/lib$(ARCH).o
LIBS-y += $(CPUDIR)/lib$(CPU).o
ifdef SOC
LIBS-y += $(CPUDIR)/$(SOC)/lib$(SOC).o
endif
LIBS-y += board/$(BOARDDIR)/lib$(BOARD).o
LIBS-$(HAVE_VENDOR_COMMON_LIB) += board/$(VENDOR)/common/lib$(VENDOR).o
START := $(addprefix $(SPLTREE)/,$(START))
LIBS := $(addprefix $(SPLTREE)/,$(sort $(LIBS-y)))
__START := $(subst $(obj),,$(START))
__LIBS := $(subst $(obj),,$(LIBS))
# Linker Script
ifdef CONFIG_SPL_LDSCRIPT
# need to strip off double quotes
LDSCRIPT := $(addprefix $(SRCTREE)/,$(subst ",,$(CONFIG_SPL_LDSCRIPT)))
endif
ifeq ($(wildcard $(LDSCRIPT)),)
LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-spl.lds
endif
ifeq ($(wildcard $(LDSCRIPT)),)
LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot-spl.lds
endif
ifeq ($(wildcard $(LDSCRIPT)),)
$(error could not find linker script)
endif
# Special flags for CPP when processing the linker script.
# Pass the version down so we can handle backwards compatibility
# on the fly.
LDPPFLAGS += \
-include $(TOPDIR)/include/u-boot/u-boot.lds.h \
-include $(OBJTREE)/include/config.h \
$(shell $(LD) --version | \
sed -ne 's/GNU ld version \([0-9][0-9]*\)\.\([0-9][0-9]*\).*/-DLD_MAJOR=\1 -DLD_MINOR=\2/p')
ALL-y += $(obj)u-boot-spl.bin
all: $(ALL-y)
$(obj)u-boot-spl.bin: $(obj)u-boot-spl
$(OBJCOPY) $(OBJCFLAGS) -O binary $< $@
GEN_UBOOT = \
UNDEF_SYM=`$(OBJDUMP) -x $(LIBS) | \
sed -n -e 's/.*\($(SYM_PREFIX)__u_boot_cmd_.*\)/-u\1/p'|sort|uniq`;\
cd $(obj) && $(LD) $(LDFLAGS) $(LDFLAGS_$(@F)) $$UNDEF_SYM $(__START) \
--start-group $(__LIBS) --end-group $(PLATFORM_LIBS) \
-Map u-boot-spl.map -o u-boot-spl
$(obj)u-boot-spl: depend $(START) $(LIBS) $(obj)u-boot-spl.lds
$(GEN_UBOOT)
$(START): depend
$(MAKE) -C $(SRCTREE)/$(CPUDIR) $@
$(LIBS): depend
$(MAKE) -C $(SRCTREE)$(dir $(subst $(SPLTREE),,$@))
$(obj)u-boot-spl.lds: $(LDSCRIPT) depend
$(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P - < $< > $@
depend: $(obj).depend
.PHONY: depend
# defines $(obj).depend target
include $(SRCTREE)/rules.mk
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