[XS] Change in coreboot[main]: drivers/intel: Align FSP debug handler with EFI calling convention

[Subrata Banik (Code Review)]

Attention is currently required from: Andrey Petrov, Arthur Heymans, Kapil Porwal, Nick Vaccaro.

Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/81621?usp=email )

Change subject: drivers/intel: Align FSP debug handler with EFI calling convention
......................................................................

Patch Set 4:

(1 comment)

Patchset:

PS4:
> > When mixing 32bit FSP with 64bit coreboot using trampolines, this might not work so well: see https://review.coreboot.org/c/coreboot/+/79823 . Any thoughts?
>
> To be clear, that code was WIP and does not work yet, so it should not be stalling your effort here. Just wondering what your take would be on this.

Thanks for sharing the CL.

So far (this patch train and few are in another thread) we are testing 32-bit FSP with 32-bit build/booting and likewise for 64-bit FSP/coreboot combination. There are CLs in the pipeline that we are testing to complete the Meteor Lake 64-bit transition as POC. Featurewise there is no regression.