Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/36865 )
Change subject: mb/google/hatch: Override CPU flex ratio ......................................................................
Patch Set 9:
Patch Set 9:
So, is it just the ratio that should be active while that vboot code runs or is there another effect of flex ratio that helps here?
this needs a soft reset to apply new flex ratio. hence its better we set this early.
Also as i told we are trying to minimize the platform (+SOC) power consumption in FW boot hence trying not to boot using non-turbo max.
I'm asking because flex ratio seems to have some side effects that might need more attention.
I don't get this part, can you please help to explain about side effect?
And if just changing the frequency is enough, we could just set a different speed-step state with a single MSR write, no?
Are you referring at EIST here ?