Change in coreboot[master]: payloads: Add UefiPayload support to ARM64 platforms

[Hung-Te Lin (Code Review)]

Attention is currently required from: Martin Roth, Rex-BC Chen, Paul Menzel, Julius Werner, Marty E. Plummer.
Hung-Te Lin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/58054 )

Change subject: payloads: Add UefiPayload support to ARM64 platforms
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Patch Set 7:

(1 comment)

Patchset:

PS6:
> modify sys-boot/edk2/edk2-9999.ebuild for this.

That's chromeos build environment, not pure coreboot env.
> This is my typo. We only use toolchain of coreboot-sdk and do not use any tool from chromeos.

It's not about coreboot-sdk or not. Given you are changing the payloads, non-chromeos coreboot developers should be able to build the tianocore without chromeos repos.

Please verify again with my steps, inside a pure coreboot checkout:

1. make menuconfig
2. select Mainboard -> Vendor=Google, model=Cherry
3. select Payload -> Add a payload -> Tianocore
4. make -j
5. build/cbfstool  build/coreboot.rom extract --name fallback/payload --file out.elf -m arm64
6. file out.elf # ELF 64-bit LSB executable, ARM aarch64
7. strings out.elf | grep tianocore # lots of tianocore stuff

You may update this to the description if that also works for you.