[coreboot-gerrit] [XS] Change in coreboot[main]: drivers/pc80/rtc/option.c: Reset only CMOS range covered by checksum

[Bill XIE (Code Review)]

Attention is currently required from: Jonathon Hall, Jérémy Compostella.

Hello Jonathon Hall, Jérémy Compostella,

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

https://review.coreboot.org/c/coreboot/+/78906?usp=email

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

Change subject: drivers/pc80/rtc/option.c: Reset only CMOS range covered by checksum
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drivers/pc80/rtc/option.c: Reset only CMOS range covered by checksum

Proposed in the comment of commit 29030d0f3dad
("drivers/pc80/rtc/option.c: Stop resetting CMOS during s3 resume"),
during sanitize_cmos(), only reset CMOS range covered by checksum, and
the checksum itself from the file cmos.default in CBFS, in order to
prevent other runtime data in CMOS (e.g. the DRAM training data on
GM45 platforms for s3 resume) being erased.

Tested: cherry-pick this commit before commit 44a48ce7a46c ("Kconfig:
    Bring HEAP_SIZE to a common, large value"), which is already
    before my commit 29030d0f3dad , Thinkpad X200 with
    CONFIG(STATIC_OPTION_TABLE) can resume from s3 again,
    indicating that DRAM training data are no longer erased.

Signed-off-by: Bill XIE 
Co-authored-by: Jonathon Hall 
Change-Id: I872bf5f41422bc3424cd8631e932aaae2ae82f7a
---
M src/drivers/pc80/rtc/option.c
1 file changed, 5 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/06/78906/4