[coreboot-gerrit] [M] Change in coreboot[main]: sb/intel/common: Add GPIO serial blink console support

[Keith Hui (Code Review)]

Attention is currently required from: Intel coreboot Reviewers, Jérémy Compostella, Nicholas Chin, Paul Menzel.

Hello Intel coreboot Reviewers, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/86390?usp=email

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

The following approvals got outdated and were removed: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

Change subject: sb/intel/common: Add GPIO serial blink console support
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sb/intel/common: Add GPIO serial blink console support

Intel ICH/PCHs from ICH8 onwards have the ability to blink arbitrary
messages (in this case, our console) onto a GPIO line. Idea is to
place an optical sensor over an LED controlled by the GPIO line with
serial blink enabled to "watch" the blinking and extract the messages.

Add support for serializing coreboot console over this channel.
Documentation to follow pending decision on reorganization.

This scheme is supported by up to the 9-series PCHs.

Change-Id: I0741142fe21eba4989d28b96e795d3bfa3085466
Signed-off-by: Keith Hui 
---
M src/console/Kconfig
M src/console/console.c
M src/include/console/console.h
A src/include/console/gpsb.h
M src/southbridge/intel/common/Makefile.mk
M src/southbridge/intel/common/gpio.c
M src/southbridge/intel/common/gpio.h
A src/southbridge/intel/common/gpsb.c
8 files changed, 193 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/90/86390/4