PSPtool does not describe Coreboot Images

[simplepenguin]

Hello,
When I try to run psptool on amdfw.rom ( or really any zen1 coreboot images eg. zork, trembyle, etc ... ), I don't seem to get any psp information. Is there a header that's throwing off the tool? Shouldn't the binaries be the same?

simplepenguin@localhost$ psptool amdfw.rom
Warning: Input  file < 16M, will assume 8M ROM ...

[cwerling]

Hello! I'm not very familiar with building/using coreboot, or more specifically the amdfw.rom file. If I can get ahold it, though, I'm happy to into how it differs from a full BIOS ROM. Can you send it or point me to it? (Couldn't find it in the coreboot repo, because of legal issues I assume?)

[simplepenguin]

Hello,

Here in the coreboot repo,
https://github.com/coreboot/coreboot

If I try to build a generic Zen1 platform - for example take this AMD board ( rather than the google boards which are too complex for me to understand )
https://github.com/coreboot/coreboot/tree/master/src/mainboard/amd/bilby

I can't seem to read the psptool output - I localized the offset to 0x20000 but it seems that the generated coreboot.rom file does not produce any output from psptool still.

here were my commands after downloading coreboot

cd coreboot
make menuconfig

I created the following .config file
config

Then navigated to the build directory, and found two artifact files that were interesting
coreboot.rom, and amdfw.rom ( I'm not sure of the legality of these rom files unfortunately )

Here is the coreboot.rom, and amdfw.rom file zipped in case you would like to test
artifacts.zip

[hanetzer]

Hello! I'm not very familiar with building/using coreboot, or more specifically the amdfw.rom file. If I can get ahold it, though, I'm happy to into how it differs from a full BIOS ROM. Can you send it or point me to it? (Couldn't find it in the coreboot repo, because of legal issues I assume?)

there are no amdfw.rom's in the coreboot tree, as they are generated at build time, from both the psp firmware
components and the coreboot bootblock (the first x86 code ran on these platforms). It starts with the aa55aa55
signature itself.

[hanetzer]

I'll elaborate on this a bit. by manually loading a ryzen coreboot.rom in python shell, it does 'work' to a degree.
however, psp.blob.roms is an empty array (? [] is the python shell's representation of it).
I assume that's because somewhere in the logic it does some kind of magic to find a UEFI rom, which
coreboot is not. I can't quite figure out where in the logic blob.roms is actually populated or how.
The FET signature aa55aa55 does exist where it is expected to be, so its not that.