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Date: Tue, 17 Jun 2025 10:05:34 -0700 (PDT)
X-X-Sender: jeremyd AT resin DOT csoft DOT net
To: Sebastian Feld <sebastian DOT n DOT feld AT gmail DOT com>
cc: cygwin AT cygwin DOT com, Radek Barton <radek DOT barton AT microsoft DOT com>
Subject: Re: Cygwin AArch64 testing with Windows AArch64 on qemu?
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On Tue, 17 Jun 2025, Sebastian Feld via Cygwin wrote:

> Now that Microsoft is porting Cygwin to Aarch64:
>
> Do you know how to run Windows Aarch64 in qemu, so people can test
> Cygwin Aarch64 changes?
>
> Sebi

Yes, but as others have said it is too slow to really be practical.

What I've done lately is use WinPE - they added an option to install x64
emulation support in 24H2, and this runs OK in qemu and can run Cygwin.

https://github.com/jeremyd2019/winpebuilder

Unfortunately, I think the license of WinPE disallows redistributing, so I
have this GHA workflow to build a nice little package, I download the
artifact, and then delete it immediately to try not to violate the
license.

I have run Windows on a Raspberry Pi 3B+ and 4, but 24H2 now
requires instruction sets that are not present in that hardware so 23H2 is
the newest release you can run on there.  I don't have a pi 5, and don't
know if the drivers and efi firmware have caught up with that yet.

GHA now has windows-on-arm runners, so that is really going to be a boon
to open-source developers who don't have access to the hardware.

https://github.com/actions/partner-runner-images?tab=readme-ov-file#windows-11-by-arm-limited

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