Bug#1004126: memtest86+.iso does not boot from USB
On Fri, Jan 21, 2022 at 02:57:50PM +0100, Michael Prokop wrote:
> * 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?
I can confirm that the X121e has its boot mode set to "Legacy only". The
T520 will be running the test until tomorrow morning.
Greetings
Marc
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