Hi, On 8/30/21 9:35 PM, Gordon Messmer wrote: > On 8/30/21 12:08 PM, Hans de Goede wrote: >> >> I checked the entry on a Windows multiboot system and it does not have the >> "insmod chain" line, maybe droppint that helps? > > > Same result. GRUB returns immediately to its menu. I'm certain the path is correct, because GRUB will report an error if it is wrong. So I took a quick look myself and I could not get this to work either, the EFI binary is weird and the talk of "Linux handoff protocol" in the README makes me think that the grub menu entry actually should look like this: linux <path>/pcmemtest.efi I tried that, with Fedora's grub but it does not work either (the screen goes black IIRC). Still I believe this is how it is supposed to work, also because of this: [root@x1 ~]# file /boot/efi/EFI/fedora/pcmemtest.efi /boot/efi/EFI/fedora/pcmemtest.efi: Linux kernel x86 boot executable bzImage, version \353fHdrS\014\002, RW-rootFS, I believe this is not working with Fedora's EFI grub binaries because we patch grub to not use the handover protocol when running in EFI mode. The Linux x86_64 vmlinuz image actually has an EFI stub, so that it can be executed as an EFI executable without needing a bootloader at all. And AFAIK that stub actually works better / on more hw then letting grub do the BIOS oriented handover-protocol thingie on EFI. So the Fedora EFI grub is patched to treat a "linux" line as a chainload line (more or less) with the exception of doing some stuff to pass the cmdline + initrd. It might be interesting to try and using e.g. an EFI grub binary from Ubuntu with a: linux <path>/pcmemtest.efi menu entry, to confirm my theory and after that it is probably best to reach out to pcmemtest's upstream about this. Regards, Hans p.s. Note that pcmemtest does not really seem to be a "proper" EFI app instead it just contains the bare essentials to run, but e.g. keyboard input does not work unless the BIOS compat module of the EFI is enabled, which now a days usually it is not. So I'm afraid that getting this ready will require a fair amount of work. _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
