[coreboot-gerrit] [S] Change in coreboot[master]: {commonlib/drivers}: Have option to store MRC version inside CBMEM

[Subrata Banik (Code Review)]

Attention is currently required from: Andrey Petrov, Kapil Porwal, Ronak Kanabar, Subrata Banik.

Hello Andrey Petrov, Kapil Porwal, Ronak Kanabar, Tarun Tuli, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/75921?usp=email

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

Change subject: {commonlib/drivers}: Have option to store MRC version inside CBMEM
......................................................................

{commonlib/drivers}: Have option to store MRC version inside CBMEM

This patch introduces CBMEM ID to store the MRC version (similar to
existing implementation that stores the FSP-M version inside CBMEM ID)
inside cbmem so the version information is available across the
different coreboot stages. For example:

* romstage: Use the CBMEM ID version information to check if the MRC
            cache is valid and need to erase the MRC cache
* ramstage: Use the CBMEM ID to store the MRC cache into the
            non-volatile space.

BUG=b:261689642
TEST=Able to build and boot google/rex and dump the MRC version as
below.

cbmem --list
  CBMEM table of contents:
      NAME                  ID        START     LENGTH
      ...
      21. MRC VERSION       5f43524d  75ffeb60  00000004
      ...

localhost ~ # cbmem -r 5f43524d | hexdump
  00000000  01 12 07 00

Signed-off-by: Subrata Banik 
Change-Id: I91f735239b33c6f8ba41c076048903e4b213c6a2
---
M src/commonlib/bsd/include/commonlib/bsd/cbmem_id.h
M src/drivers/intel/fsp2_0/memory_init.c
M src/drivers/intel/fsp2_0/save_mrc_data.c
3 files changed, 28 insertions(+), 9 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/21/75921/2