[M] Change in coreboot[master]: payloads/edk2: Add an option to use EDK2 Universal Payload

[Sean Rhodes (Code Review)]

Attention is currently required from: Sean Rhodes, Martin L Roth, Matt DeVillier, Stefan Reinauer, Lean Sheng Tan.

Hello build bot (Jenkins), Martin L Roth, Matt DeVillier, Stefan Reinauer, Lean Sheng Tan,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/65934

to look at the new patch set (#40).

Change subject: payloads/edk2: Add an option to use EDK2 Universal Payload
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payloads/edk2: Add an option to use EDK2 Universal Payload

This add's an option to use EDK2's Universal Payload instead
of the standard UefiPayloadPkg. Universal Payload requires
a ShimLayer, to build the required HOBs and pass them to Universal
Payload.

The ShimLayer is built to encompass UniveralPayload, so only
one ELF binary is added to coreboot.

Universal Payload is based on Intel's USF specification:
https://universalscalablefirmware.github.io/documentation/

This has been added with the repository pointing to
https://github.com/starlabsltd. The required ShimLayer patches
will be merged into edk2 master once corresponding coreboot
patches are merged.

This is because the EDK2 engineers believe it is an impossible
task to patch coreboot to build and use Universal Payload.

Signed-off-by: Sean Rhodes 
Change-Id: I17cc86d5eac0d5d91551ba5bea73fbc07ebdf0d3
---
M payloads/external/Makefile.inc
M payloads/external/edk2/Kconfig
2 files changed, 59 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/34/65934/40