[M] Change in coreboot[main]: soc/intel/cse: Back up PSR data during CSE FW downgrade

[Anil Kumar K (Code Review)]

Attention is currently required from: Jérémy Compostella, Krishna P Bhat D, Paul Menzel, Rizwan Qureshi, Subrata Banik, sridhar siricilla.

Anil Kumar K has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74577?usp=email )

Change subject: soc/intel/cse: Back up PSR data during CSE FW downgrade
......................................................................

Patch Set 52:

(2 comments)

File src/soc/intel/common/block/cse/cse_lite.c:

https://review.coreboot.org/c/coreboot/+/74577/comment/b735b9eb_67110f84 :
PS50, Line 1081: cse_boot_to_rw
> i'm unable to follow this line. […]

as explained above we do not want to prevent the system to boot whenever there is a failure to PSR backup attempt.

https://review.coreboot.org/c/coreboot/+/74577/comment/01f4cb73_1a5a1c0c :
PS50, Line 1092: goto log_and_exit;
> > yes. we do not want to make PSR backup attempt failure as a catastrophic event and go to recovery. […]

As Rizwan mentioned , we backup data whenever possible. When there is a failure to backup (which is a rare event) we dont want to go to recovery. We log that as an event and continue to boot.