[coreboot-gerrit] Change in coreboot[master]: soc/mediatek/mt8192: Reserve 44K SRAM for MPUPM working buffer

[Yidi Lin (Code Review)]

Yidi Lin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/46401 )

Change subject: soc/mediatek/mt8192: Reserve 44K SRAM for MPUPM working buffer
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Patch Set 17:

Hi Hung-Te
> Does MPUPM use SRAM even after kernel is up, or we're simply loading it for temporary, like SPM?

MPUPM image will be loaded and run in its own SRAM 0x0C540000. (CB:46392)
MPUPM exchanges data with kernel driver using SRAM 0x00115000 ~ 0x0011ffff.
The address is hardcoded in MPUPM image and is unlikely to change.
> If a permanent RAM is needed, can we use DRAM (we can still preserve that as CBMEM)?

MPUPM does not use DRAM.