Re: hd-media and uefi

This seems to be the relevant docs:

https://uefi.org/specs/UEFI/2.11/03_Boot_Manager.html#boot-mechanisms

If I understand correctly, a partition table is not required, per that
spec.
Does anyone agree/disagree?



On Thu, Aug 20, 2026 at 10:25 PM Carl Karsten <[email protected]> wrote:

> Can someone point me to a spec or something that defines waht a valid uefi
> boot device is?
>
> background: I use the hd-media image (becuase it is a fat fs so I can
> mount and edit kernel boot parameters) but hd-image is not efi at all (it
> doesn't even try.)  I have an MR that addresses it but needs work:
> https://salsa.debian.org/installer-team/debian-installer/-/merge_requests/7
>
> The post is related, but new as I just now found an HP server that won't
> boot my patched hd-media.   and I am compelled to figure out what correct
> is.
>
> What I did figure out: fdisk /dev/usb-stick, create 1 partition.  dd the
> hd-media.img to the partition instead of the host device.   The HP likes
> this.
>
> Once I find a good description of what the efi spec is, we can talk about
> making hd-media efi.
>
> --
> Carl K
>


-- 
Carl K