[M] Change in coreboot[main]: soc/amd/common/block/lpc: Use ROM3 window if possible

[Felix Held (Code Review)]

Attention is currently required from: Fred Reitberger, Jason Glenesk, Martin L Roth, Matt DeVillier, Maximilian Brune, Patrick Rudolph, Paul Menzel, Varshit Pandya.

Felix Held has posted comments on this change by Patrick Rudolph. ( https://review.coreboot.org/c/coreboot/+/86584?usp=email )

Change subject: soc/amd/common/block/lpc: Use ROM3 window if possible
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Patch Set 12:

(1 comment)

File src/soc/amd/common/block/spi/mmap_boot_rom3.c:

https://review.coreboot.org/c/coreboot/+/86584/comment/ee664f28_205fad14?usp... :
PS11, Line 62:  *             0   +------------+ ------------------------------0xFF0000000--+--------------+- rom2_start
> Another issues that needs to be solved: While SMM is x86_64 the page tables in SMM only give access  […]

since the patch added before this one makes sure that the assumption we make will be valid, i'll mark this one as resolved. still have to fully review the code though