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LongSoft / UEFITool

UEFI firmware image viewer and editor
BSD 2-Clause "Simplified" License
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[Question] Is there any way to know if the Bios image has AMD PSB support ? #262

Closed AkechiShiro closed 2 years ago

AkechiShiro commented 2 years ago

Hi,

I'm looking at different bios updates from Lenovo specifically, and there was a recent polemic around Lenovo applying AMD PSB to some of their machine, essentially vendor locking the CPU to only their motherboards. I want to know if there is a way to check if there is such a feature by looking into the BIOS firmware.

Just like there is a way to check for Intel BootGuard support (which is currently possible using UEFITool) is there any way AMD PSB (Platform Secure Boot) can be detected in any way ?

I'm also trying to find when AMD PSB first landed in Ryzen's CPUs, is it present in all CPUs ? I think the feature can only be enabled by the vendor, if so how can we make sure this feature is indeed enabled (like should we just brick the machine intentionally flashing a custom BIOS ?)

If there is no way at the moment, could there be work for a way to do this check ? How could we get started, I'm willing to give a try at working at this.

NikolajSchlej commented 2 years ago

I think some other projects like https://github.com/PSPReverse/PSPTool might answer this question. UEFITool had been developed before PSP got popular, and neither me nor @vit9696 had an AMD machine or a need to support them in UEFITool since.

If you would like to try adding such a support, consider learning how PSPTool works and porting the structures and parsers from there enough to be able to get to UEFI firmware volumes.

AkechiShiro commented 2 years ago

A recent implementation for this has landed ? Or you're still recommanding to use other tools ?

NikolajSchlej commented 2 years ago

I still recommend using PSPTool, because UEFITool currently has little to no support for AMD-specific things like PSP structures, and will unlikely to get it any time soon, if somebody won't contribute a bunch of code to implement it.

I'll create another issue about adding support for AMD-specific things.

AkechiShiro commented 2 years ago

Be sure to tag me on the new issue, I might try to help or test