What is SPL?
SPL: Secondary Program Loader
Unlike NOR flash, many boot sources are not directly memory mapped.
On-chip ROM or other mechanism loads a binary into an SRAM.
– This SRAM is often very small, sometimes 4 KiB or less.
– The ROM can't load us into main system RAM yet, since initialization is too complex and must be handled by U-Boot.
SPL (Secondary Program Loader) is a small binary, generated from U-Boot source, that fits in the SRAM and loads the main U-Boot into system RAM.
Configured by a parallel set of makefile config symbols
– CONFIG_SPL_I2C_SUPPORT, CONFIG_SPL_NAND_SUPPORT, etc.
– Normal CONFIG symbols also used, but not to control the differences between the SPL and the main U-Boot.
– SPL also relies heavily on toolchain garbage collection.
Reference
http://www.denx.de/wiki/pub/U-Boot/MiniSummitELCE2013/tpl-presentation.pdf
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