Booting Linux bzImage on x86_64

[Michael Olbrich]

Hi,

On Wed, Oct 28, 2015 at 09:50:06PM +0100, Viktor Stark wrote:
> I recently discovered barebox and I am trying to boot a Linux bzImage on an
> x86_64 embedded platform.
> 
> Some background: My project involves an x86_64 embedded device for which I am
> building a bzImage and a root filesystem with buildroot. The idea is to have
> multiple combinations of these in order to serve different use cases, but
> also for fallback situations.
> 
> I went down both possible ways on x86, but cannot really find a way to boot a bzImage.
> 
> Both configurations are tested under QEMU with barebox 2015.10.0.
> 
> 1. EFI - I have a working barebox.efi living inside an EF00 partition. The
> issue I am having is that I cannot really find any pointers as to how to boot
> a bzImage from these. I have found some earlier posts on the list indicating
> that it is not possible to boot a bzImage from EFI, but also a G+ post saying
> that it is possible.

I'm running my Laptop with Barebox on EFI, so it's certainly possible.
Without any error messages I can only guess what the problem might be.
Have you enabled CONFIG_EFI_STUB in your kernel config? This is necessary
for barebox to boot your kernel.

> 2. Non-EFI - I have compiled barebox with the attached config file, but it
> seems to triple fault according to qemu. AFAICT (zero asm knowledge here), it
> seems to be in pmjump.S.
> Triple fault

This is _really_ old code. Nobody has tested this in a long time. It's most
likely broken in many ways. Don't use it unless you're interested in
barebox development and want to fix it :-).

Regards,
Michael


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