[fedora-arm] Re: armhf dnf is not working on aarch64 kernel

>>> On Wed, Apr 27, 2016 at 1:18 PM, Chanho Park <parkch98@gmail.com> wrote:
>>> > Hi all,
>>> >
>>> > I want to use the armhf fedora rootfs on the aarch64 bit kernel.
>>>
>>> You can't, it's not a use case we support.
>>
>>
>>
>> To further this piece, you would need to have code changes in rpm, dnf,
>> yum,
>> packagekit, mock and everything else dealing with rpm installation and
>> removal. none of the tooling supports what you are asking.
>
>
> That must be some very recent code. I can confirm that CentOS 7
> armv7hl works just fine with just the /etc/rpm/platform configured
> appropriately in the chroot on an aarch64 host (with a non-default
> kernel built with 4KB pages). No dnf, granted, since that is more
> recent than F19, but all the rest of it works just fine.

Maybe that's something that CentOS have added (don't know, haven't
looked), RHELSA doesn't support it that I'm aware of and they're
definitely only 64K page size. The biggest change is in rpm and the
arch mappings there.

> So unless there has been a lot of bit rot since F19, it seems
> unlikely any of the rest of it would need fixing.

Maybe, early Fedora on aarch64 was 4K pages during bringup but it
became clear early on that various orgs wanted 64K pages so the
decision was made to move.

>> Some aarch64 hardware will not run 32 bit binaries at all. when we started
>> on
>> the path of supporting aarch64 we mad a concious decision not to support
>> running armhfp or arm 32 bit binaries on 64 bit environments. the
>> supported
>> way to run 32 bit binaries is to do so in a 32 bit vm.
>
>
> Unless I am missing something, even ignoring the very non-trivial
> performance hit of running in a VM, if the hardware doesn't support
> the 32-bit instruction set, then the VMs won't work either, so I'm
> not sure what the point being made here is.

Yes, because the instructions can be dealt with by the hypervisor
whether through emulation, or some other mechanism.
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