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Re: How to boot a 32-bit Ubuntu on a 64-bit EFI machine?

From: Andrei Borzenkov
Subject: Re: How to boot a 32-bit Ubuntu on a 64-bit EFI machine?
Date: Sun, 12 Sep 2021 21:52:37 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0

On 12.09.2021 15:38, Ulf Zibis wrote:
> Hi,
> few years ago, I was able to boot my 32-bit Ubuntu on a 64-bit EFI
> machine with a 64 bit EFI GRUB. This worked fine for Ubuntu 16.04 and
> 18.04 over long time.
> But since latest updates

updates of what?

> I get:
> "Kernel does not support 64 bit cpu"

Is it exact error message? When is it printed? Is it output by grub or
kernel? I do not see this error in grub.

> So my queston is, if there has something been changed in recent versions
> of GRUB which prevents from booting 32-bit Linux on 64-bit EFI machines.

I briefly tried booting 32 bit openSUSE Tumbleweed kernel from within 64
bit EFI grub 2.06 in QEMU and I did not observe any errors from grub.
After issuing "boot" command I do not see any kernel messages but I
cannot say if this is due to qemu or kernel or something else.

> Or is the cause to search for in Ubuntu's flavour of GRUB?
> Regards,
> -Ulf

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