Bug#892406: live-build: UEFI boot fails on SuperMicro dev board with AMI bios

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

i managed to build a live-build ISO.
Its /boot/grub/efi.img contains
  /efi/boot/bootia32.efi
  /efi/boot/bootx64.efi
which both show by "strings" the embedded configuration with
  search --file --set=root /.disk/info
The ISO 9660 filesystem contains a file
  /.disk/info

So the riddle is why this does not get into effect with that particular
EFI implementation, and why a grub.cfg in the EFI System Partition
solves the problem.

Does a debian-cd ISO boot properly on that EFI ?
E.g.
  https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-9.4.0-amd64-netinst.iso


I meanwhile found out that the efi.img of debian-cd stems from
debian-cd_info.tar.gz created by
   https://anonscm.debian.org/git/d-i/debian-installer.git/tree/build/util/efi-image
and that its grub-mkimage run needs no -c option because it has an -m option
with a grub.cfg file in the "memdisk" tarball. It's quite the same tarball
as created by live-build in
   https://salsa.debian.org/bluca/live-build/blob/master/scripts/build/efi-image

So it might be that debian-cd is affected as well.
If not, then differences between both ISOs might give hints about the cause.


Have a nice day :)

Thomas