* Marc Haber [Fri Jan 21, 2022 at 02:41:03PM +0100]: > On Fri, Jan 21, 2022 at 02:33:44PM +0100, Michael Prokop wrote: > > * Marc Haber [Fri Jan 21, 2022 at 01:03:13PM +0100]: > > > I tried dd'ing the memtest86+.iso to two differen USB sticks. Both don't > > > boot on two different older ThinkPad Notebooks (one T520 and one X121e) > > > - the systems just fall back to the Boot Menu. The Free-as-in-Beer > > > memtest.iso from memtest86.com works fine on both boxes. > > I suppose your system runs with EFI, while memtest86+ needs 16-bit > > boot and doesn't work with EFI systems, AFAIK. > memtest86+.elf on the same system runs fine if booted from an USB stick > with grub-pc (not grub-efi). Is that a possible indication that the > system doesn't run with EFI? I'd like to keep it running until tomorrow. If you have /sys/firmware/efi on your running Debian system (with either efivars or efivarfs kernel module loaded), then you're running in EFI mode. grub-pc doesn't do EFI boot, so I'd assume your system was booted in legacy/compatibility mode then? regards -mika-
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