Re: geminilake fsp on Google Chromebook?

On Sat, Dec 16, 2023 at 9:16 PM James Feeney <[email protected]> wrote:

> >> Then, how do I find whether a particular fspm/fsps set is using the
> coreboot 2.2.0.0 headers or the 2.2.3.1 headers?  Those headers are very
> similar.
>
> > you can't, without knowing the exact build they came from. If they are
> Google built firmware images, they are using the Google FSP
> binaries/headers.
>
> Is that to say that the Google FSP headers may not match *any* version of
> the coreboot headers available?
>
> The FSP headers look to be setting some address offsets, which would not
> end well, if the wrong values were being used by coreboot.
>
> > For anything else, you'd need to know the tree/hash it was built from
> and which header values were selected by the build.
>
> Hmm - so in the end, "trial and error", if I really wanted to use the
> extracted Google FSP binaries.  I'm hoping that other extracted Google
> blobs are not so finicky - the Embedded Controller blob, for instance?
>

no, the Google GLK FSP headers in upstream coreboot are correctly selected
if using a Google mainboard. if you're using my tree, then I expect you're
going to use my blobs submodule as well, and everything is correctly
selected there.

Though I don't know why you'd want to use Google's older headers/binaries
given the option.


>
> >> Where your config is for the edk2 payload, is there any reason that
> these same edk2 FSP files would not also work with the LinuxBoot payload?
>
> > I have no idea what you are asking here - edk2 FSP files? That phrase
> does not make sense to me. I'm also not familiar with the LinuxBoot payload
> or how it would relate to edk2
>
> Ha!  I'm expecting that the FSP files being used should have nothing at
> all to do with the eventual coreboot payload.  I was just asking for
> confirmation.  Though I'm not completely unfamiliar with firmware
> generally, with coreboot and Google firmware, sometimes my assumptions are
> correct, and sometimes they are completely off-base and wrong.
>
> As far as playing with LinuxBoot itself, yes, I know that I may be on my
> own for that.
>

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