uboot SPL Overview
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Introduction:
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The idea is to build a mini u-boot(same as UBL in Davinci?)out of the u-boot tree that fits into SoC's internal SRAM(<=64K) and bootloads the real u-boot into the SDRAM, then thereal u-boot will load the kernel into the SDRAM and boot it.:-).
Such a mini u-boot is typically calledSPL(Second Program Loader) in u-boot terminology.
Duty of SPL:
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1> Basic ARM initialization
2> UART console initialization
3> Clocks and DPLL locking (minimal)
4> SDRAM initialization
5> Mux (minimal)
6> BootDevice initialization(based on where we are bootingfrom.MMC1/MMC2/Nand/Onenand)
7> Bootloading real u-boot from the BootDevice and passingcontrol to it.
BTW:
TI's X-loader is just one implemention of SPL out of theu-boot tree, And it depends on the u-boot source tree. sameframework with u-boot. The u-boot guys will implement their own SPLin the tree. and then our system will boot without x-loader's help.:-)
Reference:
http://lists.denx.de/pipermail/u-boot/
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