Comment 49 for bug 1899308

Hi,

i now am boss of my mainboard ASUS ProWS C246-ACE EFI firmware 1401,
at least as long i do not want to disable Secure Boot.
The hardware provider was of not of help with USB sticks, but remembers
to have inserted Debian 10.4.0 netinst on CD-RW when SSD and HDD were
still without bootable system.

The EFI confused me old BIOS owner by not attributing external devices
a high boot priority. I have to go into the EFI setup and move the
offered drive (USB stick or CD reader) to the top of the list.
Then it boots.

This setting gets forgotten as soon as i boot again.

Next stumblestone was that my large 128 GB stick causes a long delay
with booting, is then not presented as boot device, and does not show
up in a booted Debian 10, if i plug it into a blue USB socket.
In a black socket it works for Linux and is recognized by EFI after i
powered down the machine after unplugging from blue and plugging into
black.
(An old 2 GB stick with Debian 10.4.0 netinst on it works at blue USB
sockets.)

I tested from USB stick successfully up to the GRUB menu:

  groovy-desktop-amd64.iso 20201007.1 MBR-only

  groovy-desktop-amd64.iso 20201010 GPT without boot flag

  groovy-desktop-amd64.iso 20201015 GPT with boot flag

The 20201010 version was also tested from DVD+RW. (There is no difference
between the three ISO as far as the El Torito catalog is concerned.)

Have a nice day :)

Thomas