[coreboot] Re: AMDFlaws

[Kyösti Mälkki]

On Sun, Feb 17, 2019 at 8:47 AM Mike Banon  wrote:
> Hi,

Almost all the coreboot-supported AMD 16h boards are AMD _early_ 16h
> (so no PSP). Please tell what 16h systems do you have, maybe they
> don't have a PSP at all?

Well pcengines/apu2 variants are fam16h model30h with PSP.

I have done experiments with it to reduce PSP blob footprint, see the
branch [1] in gerrit. There is some (NDAd) documentation about the firmware
signatures and one can capture PSP firwmare POST codes from LPC. Now since
the build of x86 AGESA blob used never actually sends PSP the message RAM
is ready, I figured that we may never actually load the "PSP Secure OS" but
only the bootloader part.

Also, don't forget pre-PSP silicons still have SMU/PMU.

[1] https://review.coreboot.org/q/topic:%22amd-fw-layout"