On Fri, Aug 29, 2025 at 01:57:27PM -0500, Michael Parson wrote: > On Wed, 20 Aug 2025, Lionel Élie Mamane wrote:
>>> 2) Go back to main screen and Continue, which reboots, get the grub >>> screen, tries to load the default and it reboots. >>> I found a thread from May 2023 where someone else reported the same >>> boot loop. >>> His solution: >>>> Something had changed the "debian" EFI boot option to load >>>> directly grubaa64.efi instead of DtbLoader.efi. >>>> I added another boot option "Debian-LEM" that loads DtbLoader.efi >>> Thing is, I can't get back into even the installer or >>> recovery-mode from the installer image >> That's not where you have to do that stuff. It happens in the >> firmware's command line. I don't think the firmware's GUI >> configuration allows to create/edit entries. >> See chapter 4 of >> https://docs.google.com/document/d/1WuxE-42ZeOkKAft5FuUk6C2fonkQ8sqNZ56ZmZ49hGI >> for inspiration. > Thanks for that info. Seems somethings have moved around a bit since > those docs were written. > Poking around a bit in the Efi shell, Looks like the partition on my > setup was FS16:\EFI\deiban\shima64.efi > Changing this to use DtbLoader.efi (which I found on another partition, > copied it to the same location as the shima64.efi) did not change > things. > I removed the 'quiet' entry from grub to see if I could see anything > else before it reboot and I saw "EFI stub: Generating empty DTB" > which made me think that it wasn't picking up the > "sc8280xp-lenovo-thinkpad-x13s.dtb" that you're supposed to copy > into place based on the Debian Wiki? > I tried copying that file to the root of FS16: as well as into > \EFI\debian, same results. dtbloader.efi expects that file to be named f249803d-0d95-54f3-a28f-f26c14a03f3b.dtb and to be placed in \EFI\DTB or \DTB, not sure now. I see the Debian wiki says something else, to put it into the root named sc8280xp-lenovo-thinkpad-x13s.dtb That's probably the/a difference between using dtbloader.efi and shima64.efi Note that for better robustness, I *added* another boot entry instead of modifying the automatically created one, so that any later update / upgrade doesn't touch my boot settings.
