Re: [Xen-devel] Xen/ARM multiboot (v2) support

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-05-24 at 00:38 +0200, Andre Przywara wrote:
> Hi Ian,
> 
> can we push multiboot v2 support for Xen/ARM still into 4.3?

I'm OK with it in principal, since it sounds like it should be rather
unobtrusive.

> It looks like it can coexists with zImage in the same binary - the 
> multiboot structure can be put just behind the zImage header and the 
> code can determine how it has been started: zImage bootloaders clears 
> r0, multiboot one's would set r0 to the MB magic.
> I will sketch a patch tomorrow, just wondering if we can have this in 
> 4.3 to have a sane booting protocol from the very beginning.

My main concern is that AFAIK multiboot2 on ARM is not well (at all?)
defined so we may (lets face it: probably will, Murphy's law and all)
end up with 4.3.0 having something which isn't actually multiboot baked
into it. However I would support backporting an incremental fix to
implement the final protocol into 4.3.x so that's probably ok.

> Of course bootloaders need to be enabled also, I could take care of the 
> u-boot port.

That would be great of course!

Ian.


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