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

[Sergii Dmytruk (Code Review)]

Attention is currently required from: Timothy Pearson, Ron Minnich.
Hello build bot (Jenkins), Arthur Heymans, Krystian Hebel, Timothy Pearson, Ron Minnich,

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

https://review.coreboot.org/c/coreboot/+/57084

to look at the new patch set (#24).

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

It's available in %r3 in bootblock and needs to be passed to payload in
%r27.  We use one of two hypervisor's special registers as a buffer,
which aren't used for anything by the code.

Change-Id: I0911f4b534c6f8cacfa057a5bad7576fec711637
Signed-off-by: Sergii Dmytruk 
---
M src/arch/ppc64/bootblock_crt0.S
M src/include/cpu/power/spr.h
M src/mainboard/emulation/qemu-power9/Makefile.inc
A src/mainboard/emulation/qemu-power9/ramstage.c
4 files changed, 32 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/84/57084/24