[coreboot-gerrit] Change in coreboot[master]: soc/amd/picasso: Create a hybrid romstage to begin in DRAM

[Marshall Dawson (Code Review)]

Hello Edward O'Callaghan, Julius Werner, Richard Spiegel, build bot (Jenkins), Furquan Shaikh, Martin Roth, Patrick Georgi,

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

https://review.coreboot.org/c/coreboot/+/33759

to look at the new patch set (#9).

Change subject: soc/amd/picasso: Create a hybrid romstage to begin in DRAM
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soc/amd/picasso: Create a hybrid romstage to begin in DRAM

Add the support files to begin execution in romstage and located in
DRAM.  Details for this implementation are found in
Documentation/amd/picasso/family17.md.

Combine steps typically found in bootblock, containing the reset
vector and protected mode enable, with the parts of romstage
that enable the console and cbmem.

Duplicate the ROMSTAGE_ADDR and ROMSTAGE_MAX_SIZE items into Kconfig
and give them safe default values in DRAM.  The DCACHE values are
kept and DRAM is used as a CAR substitute.

Add a romstage.ld file that positions the reset vector and describes
the additional items needed for the hybrid romstage.

Change-Id: Id8c6175de34a0728ad41085e9c7cd310bd280976
Signed-off-by: Marshall Dawson 
---
M src/soc/amd/picasso/Kconfig
M src/soc/amd/picasso/Makefile.inc
M src/soc/amd/picasso/include/soc/cpu.h
M src/soc/amd/picasso/include/soc/romstage.h
A src/soc/amd/picasso/include/soc/romstage.ld
A src/soc/amd/picasso/reset_vector.S
M src/soc/amd/picasso/romstage.c
7 files changed, 400 insertions(+), 72 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/59/33759/9