Re: The future of legacy BIOS support in Fedora.

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On Mi, 01.07.20 18:31, Gerd Hoffmann (kraxel@xxxxxxxxxx) wrote:

> > > One problem with sd-boot is that the kernels must stay on the ESP, which
> > > can be a problem for dual-boot installs (where Fedora has to run with
> > > the existing ESP and can't just create one which is big enouth).
> >
> > Nah, that's not true. Hasn't been for quite a while.
> >
> > sd-boot checks for kernels in the ESP first, and then on a second
> > partition we called XBOOTLDR, which also can contain kernels. XBOOTLDR
> > partition is simply a partition with type UUID
> > bc13c2ff-59e6-4262-a352-b275fd6f7172.
>
> Ah, this is news to me.  XBOOTLDR must be formated with a filesystem the
> uefi firmware can read (i.e. vfat in practice) I assume?

The spec doesn't strictly mandate that in the general case. I think it
would still be wise to stick to vfat, given that this means all kind
of firmware can easily read it, but if your boot loader/firmware can
read something else that's OK too.

> > sd-boot is uefi only, but it should work fine with any arch that is
> > supported by uefi.
>
> Seems it isn't built for armhfp in Fedora (/usr/lib/systemd/boot/efi
> doesn't exist ...).

Hmm, I know that people build it on ARM, I guess we could enable that
in Fedora too. I am not an ARM pro myself, not sure what happens there
right now.

Upstream sd-boot has support for UEFI ia32, x64, arm and aa64.

Lennart

--
Lennart Poettering, Berlin
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