[coreboot-gerrit] [L] Change in coreboot[main]: mb/dell/optiplex_9020: Implement late HWM initialization

[Máté Kukri (Code Review)]

Attention is currently required from: Varshit Pandya.

Hello build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/81529?usp=email

to look at the new patch set (#4).

Change subject: mb/dell/optiplex_9020: Implement late HWM initialization
......................................................................

mb/dell/optiplex_9020: Implement late HWM initialization

There are 4 different chassis types specified by vendor firmware, each
with a slightly different HWM configuration.

The chassis type to use is determined at runtime by reading a set of
4 PCH GPIOs: 70, 38, 17, and 0.

Additionally vendor firmware also provides an option to run the fans at
full speed. This is substituted with a coreboot nvram option in this
implementation.

This was tested to make fan control work on my OptiPlex 7020 SFF.

NOTE: This is superficially similar to the OptiPlex 9010's SCH5545
however the OptiPlex 9020's SCH5555 does not use externally
programmed EC firmware.

Change-Id: Ibdccd3fc7364e03e84ca606592928410624eed43
Signed-off-by: Mate Kukri 
---
M src/mainboard/dell/optiplex_9020/Makefile.mk
M src/mainboard/dell/optiplex_9020/bootblock.c
M src/mainboard/dell/optiplex_9020/cmos.default
M src/mainboard/dell/optiplex_9020/cmos.layout
M src/mainboard/dell/optiplex_9020/mainboard.c
A src/mainboard/dell/optiplex_9020/sch5555_ec.c
A src/mainboard/dell/optiplex_9020/sch5555_ec.h
7 files changed, 454 insertions(+), 21 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/29/81529/4