[coreboot-gerrit] [M] Change in coreboot[master]: soc/intel/xeon_sp: Add functions to store/restore uart state in smm

[Shuming Chu (Shuming) (Code Review)]

Attention is currently required from: Anjaneya "Reddy" Chagam, Johnny Lin, Christian Walter, Shuming Chu (Shuming), Arthur Heymans, Tim Chu.

Hello build bot (Jenkins), Anjaneya "Reddy" Chagam, Jonathan Zhang, Johnny Lin, Christian Walter, Arthur Heymans, Tim Chu,

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

https://review.coreboot.org/c/coreboot/+/68567

to look at the new patch set (#5).

Change subject: soc/intel/xeon_sp: Add functions to store/restore uart state in smm
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soc/intel/xeon_sp: Add functions to store/restore uart state in smm

When CONFIG_DEBUG_SMI is enabled SMM handler performs console hardware
initialization that may interfere with OS. Here we store the state
before console initialization and restore state before SMM exit.

Tested=On not public yet system, after exiting smm, uart console can
still work well.

Signed-off-by: Tim Chu 
Change-Id: Ifa5042c24f0e3217a75971d9e6067b1d1f56a484
---
M src/soc/intel/xeon_sp/smihandler.c
1 file changed, 60 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/67/68567/5