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Generic SPL framework
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
The object files for SPL are built separately and placed in the "spl" directory.
The final binaries which are generated are u-boot-spl, u-boot-spl.bin and
A config option named CONFIG_SPL_BUILD is enabled by Kconfig for SPL.
Source files can therefore be compiled for SPL with different settings.
For example:
ifeq ($(CONFIG_SPL_BUILD),y)
obj-y += board_spl.o
obj-y += board.o
obj-$(CONFIG_SPL_BUILD) += foo.o
The building of SPL images can be enabled by CONFIG_SPL option in Kconfig.
Because SPL images normally have a different text base, one has to be
configured by defining CONFIG_SPL_TEXT_BASE. The linker script has to be
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_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_POWER_SUPPORT (drivers/power/libpower.o)
CONFIG_SPL_NAND_SUPPORT (drivers/mtd/nand/libnand.o)
CONFIG_SPL_DMA_SUPPORT (drivers/dma/libdma.o)
CONFIG_SPL_POST_MEM_SUPPORT (post/drivers/memory.o)
CONFIG_SPL_NAND_LOAD (drivers/mtd/nand/nand_spl_load.o)
CONFIG_SPL_SPI_LOAD (drivers/mtd/spi/spi_spl_load.o)
CONFIG_SPL_RAM_DEVICE (common/spl/spl.c)
CONFIG_SPL_WATCHDOG_SUPPORT (drivers/watchdog/libwatchdog.o)
When building SPL with DEBUG set you may also need to set CONFIG_PANIC_HANG
as in most cases do_reset is not defined within SPL.
Estimating stack usage
With gcc 4.6 (and later) and the use of GNU cflow it is possible to estimate
stack usage at various points in run sequence of SPL. The -fstack-usage option
to gcc will produce '.su' files (such as arch/arm/cpu/armv7/ that
will give stack usage information and cflow can construct program flow.
Must have gcc 4.6 or later, which supports -fstack-usage
1) Build normally
2) Perform the following shell command to generate a list of C files used in
$ find spl -name '*.su' | sed -e 's:^spl/::' -e 's:[.]su$:.c:' > used-spl.list
3) Execute cflow:
$ cflow --main=board_init_r `cat used-spl.list` 2>&1 | $PAGER
cflow will spit out a number of warnings as it does not parse
the config files and picks functions based on #ifdef. Parsing the '.i'
files instead introduces another set of headaches. These warnings are
not usually important to understanding the flow, however.