[M] Change in coreboot[main]: nb/sandybridge: Implement automatic DRAM voltage setting

[Riku Viitanen (Code Review)]

Attention is currently required from: Angel Pons, Riku Viitanen.

Hello Angel Pons, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/85793?usp=email

to look at the new patch set (#2).

The following approvals got outdated and were removed: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

Change subject: nb/sandybridge: Implement automatic DRAM voltage setting
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nb/sandybridge: Implement automatic DRAM voltage setting

This change enables using higher performance XMP profiles that
request more than the standard 1.5V on boards that can adjust their
DRAM voltage from firmware.

Precautions are taken to not run any modules outside their
specifications. Furthermore, voltages higher than 1.65V are not
enabled by default for safety.

TEST=ASRock Z77 Extreme4. Tested various combinations of XMP and
non-XMP modules.

Change-Id: I1a8857deee85fd635429afd3cbf93cad7a7d589b
Signed-off-by: Riku Viitanen 
---
M src/device/Kconfig
M src/northbridge/intel/sandybridge/raminit.c
M src/northbridge/intel/sandybridge/raminit_common.h
M src/northbridge/intel/sandybridge/raminit_native.c
M src/northbridge/intel/sandybridge/sandybridge.h
5 files changed, 78 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/93/85793/2