Christian,

> But it seems for legacy roms like 82540em.rom CONFIG=qemu being set or not 
> doesn't make a
> difference.

(1) That's my understanding as well; from the following original iPXE
commits anyway:

- a15c0d7e868a ("[efi] Allow user experience to be downgraded", 2015-07-22),
- a200ad462e69 ("[build] Add named configuration for qemu", 2015-07-22).

(I played a part in those commits existing.)

(2) However, just to be 100% sure, I recommend *not* changing the
CONFIG=<whatever> setting for the traditional BIOS build. If you have
had CONFIG=qemu there, then keep it. If you haven't, then don't add it
now.

What matters is that the EFI build be performed with CONFIG=qemu.

(FWIW, last time I looked, in RHEL downstream we used to build iPXE with
CONFIG=qemu covering *both* the traditional BIOS image and the EFI
image. But, I don't think that's enough reason for you to diverge now
from your previous BIOS image settings in Ubuntu. I don't think you
should risk regressions with that. Really, what matters is that the EFI
image be built with CONFIG=qemu.)

Thanks
Laszlo

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https://bugs.launchpad.net/bugs/1882671

Title:
  unbalanced UEFI TPL manipulations in iPXE with DOWNLOAD_PROTO_HTTPS
  enabled

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