[coreboot-gerrit] Change in coreboot[master]: src/arch/ppc64/*: pass FDT address to payload

[Sergii Dmytruk (Code Review)]

Attention is currently required from: Krystian Hebel, Timothy Pearson, Ron Minnich.
Sergii Dmytruk has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/57084 )

Change subject: src/arch/ppc64/*: pass FDT address to payload
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Patch Set 20:

(2 comments)

File src/arch/ppc64/boot.c:

https://review.coreboot.org/c/coreboot/+/57084/comment/e833b518_d54f5103 
PS20, Line 42: 	asm("ld 27,%0" :: "m"(fdt) : "27");
> Only QEMU prepares FDT in advance, real hardware doesn't, so all of the new code should be moved to  […]

Done

File src/arch/ppc64/bootblock_crt0.S:

https://review.coreboot.org/c/coreboot/+/57084/comment/da1b7dc5_2e7a3ca1 
PS20, Line 40: 	/* Store FDT address that's available in %r3 to pass to payload */
> Maybe use one of SPRs for holding this value so it won't have to be moved around in RAM? HSPRG0 or H […]

Used HSPRG0. This significantly simplified this change.