Re: Loading pcmemtest on UEFI

[Andrei Borzenkov]

On 02.09.2021 02:25, Gordon Messmer wrote:
> I'm trying to load PCMemTest on a UEFI Fedora system.
> 
> https://github.com/martinwhitaker/pcmemtest
> 
> After placing the binary on the ESP, I'm able to create an entry with
> efibootmgr to load it directly from the UEFI boot menu, and it works as
> expected, so I'm certain that the binary is "good".
> 
> However,  I haven't been able to load the program from GRUB
> successfully.  The program's documentation says that it supports the
> UEFI handover boot protocol, and I've tried loading it using "linux
> /<path>/pcmemtest.efi", which doesn't seem to do anything.  As far as I
> can tell, the system halts.  I've also tried chainloading the binary,

You should always show exact command(s) you used, not describe it.

> and when that entry is selected, GRUB immediately returns to its menu.
> 

I briefly tried pcmemtest from
https://gordonmessmer.fedorapeople.org/pcmemtest-unsigned-x64/pcmemtest-unsigned-x64-efi-1.4-1.fc36.x86_64.rpm
with grub 2.06 (openSUSE Tumbleweed) and it runs after

chainloader (hd0,gpt1)/pcmemtest.efi
boot

or menu entry with

chainloader (hd0,gpt1)/pcmemtest.efi

> Does anyone have any basic hints for me at this point, either things
> that I should try, or anything that might tell me what's happening after
> the handover?
> 
> 
Are you sure your grub binary supports chainloader command in the first
place? Signed grub images do not include every possible grub module and
disable external module loading.