[coreboot-gerrit] Change in coreboot[master]: arch/x86/exit_car.S: Make sure _cbmem_top_ptr hits dram

[Arthur Heymans (Code Review)]

Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/37212 )

Change subject: arch/x86/exit_car.S: Make sure _cbmem_top_ptr hits dram
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Patch Set 7:

(1 comment)

https://review.coreboot.org/c/coreboot/+/37212/7/src/arch/x86/exit_car.S 
File src/arch/x86/exit_car.S:

https://review.coreboot.org/c/coreboot/+/37212/7/src/arch/x86/exit_car.S@35 
PS7, Line 35: clflush
> Use wbinv if clflush isn't supported?

I think the goal is to keep nothing left from the CAR environment. wbinv might in some cases write to RAM (corrupting RAM on S3 resume) or to 'nothing' which might have some undesirable behaviour.