[PATCH v2 2/2] Makefile: Don't allow new boards with SPL_FIT_GENERATOR

Mark Kettenis mark.kettenis at xs4all.nl
Tue Feb 1 17:08:14 CET 2022

> From: Simon Glass <sjg at chromium.org>
> Date: Tue, 1 Feb 2022 08:42:35 -0700
> It seems that rk3399 uses bl31.elf and splits out the sections into
> pieces. What a mess! I wonder if that is necessary for ATF to work? It
> seems to do the same for TEE.

That's because bl31.elf really consists of three binary blobs packed
together into a single ELF object.  This is done such that specific
bits needed for suspend/resume land in the AP's SRAM and the PMU's
SRAM while the majority lands in DRAM.  The splitting happens to make
U-Boot's ITS stuff happy.

I suppose this could be done in a different way by packing the ELF
binary itself into the FIT image, but then SPL has to parse the ELF
headers and copy things in place which may be challenging.

(I'm not familliar with the TEE stuff)

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