upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
u-boot/doc/README.ARM-SoC

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[By Steven Scholz <steven.scholz@imc-berlin.de>, 16 Aug 2004]
Since the cpu/ directory gets clobbered with peripheral driver code I
started cleaning up arch/arm/cpu/arm920t.
I introduced the concept of Soc (system on a chip) into the ./cpu
directory. That means that code that is cpu (i.e. core) specific
resides in
$(CPUDIR)/
and code that is specific to some SoC (i.e. vendor specific
peripherals around the core) is moved into
$(CPUDIR)/$(SOC)/
Thus a library/archive "$(CPUDIR)/$(SOC)/lib$(SOC).a" will be build
and linked. Examples will be
arch/arm/cpu/arm920t/imx/
arch/arm/cpu/arm920t/s3c24x0
One can select an SoC by passing the name of it to ./mkconfig just
like
@./mkconfig $(@:_config=) arm arm920t vcma9 mpl s3c24x0
If there's no VENDOR field (like "mpl" in the above line) one has to
pass NULL instead:
@./mkconfig $(@:_config=) arm arm920t mx1ads NULL imx