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Re: A thread on grub-bug could need attention

From: Thomas Schmitt
Subject: Re: A thread on grub-bug could need attention
Date: Mon, 29 Jan 2018 19:53:54 +0100


Daniel Kiper wrote:
> > 2) Create EFI System Partition (code EF00) using gdisk. 256.0 MiB will
> > suffice.
> > 3) Format EFI System Partition
> >   # mkdosfs /dev/sdb1
> >
> >4) Create GRUB2 EFI bootable image
> >   # mount /dev/sdb1 /mnt
> >   # mkdir /mnt/efi/boot
> >   # grub-mkstandalone -O x86_64-efi -o /mnt/efi/boot/bootx64.efi

Michel Bouissou wrote:
> I tested the USB stick on my son's machine, and I do get a grub prompt.

Does this mean that the decisive trick is to use GPT with EFI partition
instead of a MBR partition of type 0xEF ?

Or is there something missing in the FAT filesystem images of e.g.
Debian installation ISOs like

Michel: Does a simple ISO "output.iso" work, when made by

  mkdir ./minimal
  echo dummy >./minimal/dummy
  grub-mkrescue -o output.iso ./minimal

and then copied onto the plain USB stick device (e.g. /dev/sdc) ?
grub-mkrescue produces valid GPT in ISO 9660.

Have a nice day :)


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