[M] Change in coreboot[master]: soc/amd/common/block/apob: Add hashed APOB support

[Raul Rangel (Code Review)]

Attention is currently required from: Jason Glenesk, Matt DeVillier, Martin Roth, Fred Reitberger, Felix Held.

Raul Rangel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/67301 )

Change subject: soc/amd/common/block/apob: Add hashed APOB support
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Patch Set 5:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/67301/comment/f22ea7ab_95955ddf 
PS4, Line 15: chausie
> I don't have a guybrush to test with. […]

I'm sure you could easily get one ;)

I suspect it won't. `PSP_APOB_DRAM_SIZE` is defined as 64K, and the `RW_MRC_CACHE` is defined as 64K as well. I'm not sure what `apob_header_ptr->size` actually contains though. If it was smaller then the 64K it might work.

File src/soc/amd/common/block/apob/apob_cache.c:

https://review.coreboot.org/c/coreboot/+/67301/comment/78e93186_0c924fa8 
PS4, Line 57: apob_header_ptr->size + MRC_HASH_SIZE
> If this check fails, the device can still boot.  The actual size is not known at compile time. […]

We know this via `CONFIG_PSP_APOB_DRAM_SIZE` don't we?