[L] Change in coreboot[main]: ppc64: Kconfig switch for bootblock in SEEPROM, zero HRMOR

[Sergii Dmytruk (Code Review)]

Attention is currently required from: Arthur Heymans, Krystian Hebel, Maciej Pijanowski, Martin L Roth, Michał Żygowski, Sergii Dmytruk, ron minnich.

Hello Krystian Hebel, Maciej Pijanowski, Martin L Roth, Michał Żygowski, build bot (Jenkins), ron minnich,

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

https://review.coreboot.org/c/coreboot/+/67067?usp=email

to look at the new patch set (#33).

The following approvals got outdated and were removed:
Verified-1 by build bot (Jenkins)

Change subject: ppc64: Kconfig switch for bootblock in SEEPROM, zero HRMOR
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ppc64: Kconfig switch for bootblock in SEEPROM, zero HRMOR

On PPC64 each address is logically OR'ed with HRMOR (Hypervisor Real
Mode Offset Register) before it is dispatched to the underlying memory,
meaning that memory space overlaps at the least significant bit set in
HRMOR.  coreboot is entered with HRMOR = 4GB-128MB both on hardware
(when started by hostboot bootloader) and in Qemu in hb-mode. This means
that memory overlaps every 128MB in this particular case. HRMOR can be
explicitly ignored when MSB of an address is set, but this would require
using different memory model for linking.

If we zero HRMOR in bootblock, linking can be done against real address.
This greatly simplifies memory layout and allows to forget about HRMOR
from that point on.

Signed-off-by: Krystian Hebel 
Signed-off-by: Maciej Pijanowski 
Signed-off-by: Sergii Dmytruk 
Change-Id: I0170463968c91b943c4b0dc15fe73fa616a164da
---
M src/arch/ppc64/Makefile.mk
M src/arch/ppc64/bootblock_crt0.S
M src/mainboard/emulation/qemu-power8/memlayout.ld
M src/mainboard/emulation/qemu-power9/memlayout.ld
M src/mainboard/raptor-cs/talos-2/Kconfig
A src/mainboard/raptor-cs/talos-2/board-bootblock-in-seeprom.fmd
A src/mainboard/raptor-cs/talos-2/board.fmd
M src/mainboard/raptor-cs/talos-2/memlayout.ld
M src/soc/ibm/power9/Makefile.mk
9 files changed, 344 insertions(+), 57 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/67/67067/33