[coreboot-gerrit] Change in coreboot[master]: soc/intel/skylake/chip: Unhide P2SB device

[Angel Pons (Code Review)]

Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/35620 )

Change subject: soc/intel/skylake/chip: Unhide P2SB device
......................................................................

Patch Set 3:

(1 comment)

https://review.coreboot.org/c/coreboot/+/35620/2//COMMIT_MSG 
Commit Message:

https://review.coreboot.org/c/coreboot/+/35620/2//COMMIT_MSG@15 
PS2, Line 15: to
> Yes, that's shedding permissions by transitioning to a new fabric id that is associated with future  […]

I believe that these P2SB SAI (Security Attributes of Initiator) getting lowered at some point during boot is what makes the P2SB on newer chips (CNL and later, I think) impossible to unhide (from the OS, at least).

This is what I understood/guessed so far. I don't have access to the interesting documents which describe SAI and sideband stuffs (they are likely only available under a NDA or two, I guess).