----- Original Message -----
> From: "Alex Perez" <[email protected]>
> To: [email protected]
> Sent: Saturday, May 9, 2020 2:49:17 AM
> Subject: Re: Fedora CoreOS on multi-arch
>
> Jakub,
>
> How difficult would it be to add armhfp to the CoreOS builds? If you're
> interested in the use case, it's for the third and fourth generation
> OLPC laptops, the XO-1.75 and XO-4, both of which are based on Marvell
> MMP, and are 32-bit, with ~1GB RAM. As of Fedora 32, stock Fedora armhfp
> kernels boot and userland runs, unmodified, on the XO-1.75.
>
> Regards,
> Alex Perez
>
>
I think that it is kind of technically possible, but not that simple. IMHO
possibly harder, at least from my perspective, than ppc64le, aarch64 and s390x
together. To elaborate even aarch64 will work currently only on UEFI(qemu
somewhat tested only). I'm not really sure if there is even some that generic
way to do it for armhfp(VMs or boards). My current understanding is that even
for aarch64 there will be need to alter the produced "bare-metal" images for
the target "non standard" HW/board. Something similar to the
arm-image-installer(hopefully just patch for it).
For starting to enable the FCOS you will have to look in the
coreos-assembler(https://github.com/coreos/coreos-assembler). Either fully
build it on armhfp(IMO easier), although I believe we aren't building Fedora
base container image for it or cross build from(aarch64,hard or other system
via full emulation hardest). You should be able just start by following the
README(IMO it is extremely easy to build Fedore CoreOS locally, on x86_64) and
see what will break. One thing is sure that the armhfp will need patches for
https://github.com/coreos/coreos-assembler/blob/master/src/cmd-buildextend-metal
and few other place at minimum.
Actually one blocking point might be that you need nested virt working due to
the way how the assembler works currently. So not really that easy and I have
definitively forgotten some other possible pain points.
For me, from arm side, I hope that I will be able to have time to look in to
running FCOS on baremetal aarch64 RPI4(VM runs on rawhide Fedora fine for me ;)
) and RockPro64.
JC
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