Re: [Xen-devel] Building 32-bit xen.efi for 32-bit EFI platforms

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-11-24 at 15:09 +0000, Andrew Cooper wrote:
> On 24/11/14 14:59, Zhuan Chen wrote:
> > Hi,
> >
> > I am wondering whether it's possible to build 32-bit xen.efi for the
> > 32-bit EFI platform? One way of building xen.efi I learnt is to make
> > the binutils configured with the x86_64-pep emulation (according to
> > the document http://xenbits.xenproject.org/docs/unstable/misc/efi.html).
> > The resulted xen.efi is 64-bit mode. Is it possible to build xen.efi
> > as the 32-bit mode?
> >
> > The reason for this question is due to my effort of installing Xen on
> > the Asus Transformer Book T100, which is one of the Bay Trail Atom
> > (64-bit processors) tablets shipped with 32-bit EFI firmware. This
> > requires the support of the 32-bit EFI bootloader. Such platforms seem
> > to become common and Linux kernel from 3.15 also provides the EFI
> > mixed mode to support 64-bit kernels running from 32-bit EFI firmware.
> >
> > Thanks,
> > Zhuan
> 
> 32bit Xen support was removed in Xen 4.3, so building a pure 32bit
> hypervisor is not possible.

That's not what was asked for.

> There is an argument to be made for building a 32bit Xen.efi which is
> bootable by a 32bit firmware and moves into 64bit mode on boot.

This was.

> There is however no support for this that I am aware of.

Me neither.

Ian.


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