Re: [Xen-devel] [PATCH v11 00/13] x86: multiboot2 protocol support

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Thu, Jan 12, 2017 at 11:46:04AM -0600, Doug Goldstein wrote:
> On 12/5/16 4:25 PM, Daniel Kiper wrote:
> > Hi,
> >
> > I am sending eleventh version of multiboot2 protocol support for
> > legacy BIOS and EFI platforms. This patch series release contains
> > fixes for all known issues.
> >
> > The final goal is xen.efi binary file which could be loaded by EFI
> > loader, multiboot (v1) protocol (only on legacy BIOS platforms) and
> > multiboot2 protocol. This way we will have:
>
> So another issue I've found in the series is that xen/xen.gz is loadable
> with MB2 but xen.efi is not but includes the MB2 header so I detect it
> as a valid MB2 module. There's no entry point advertised in the xen.efi
> case.
>
> I think we'd probably just leave off the MB2 header for xen.efi and
> leave that as a plain EFI loader case.

This is known issue. xen.efi contains MB1 and MB2 headers because it is
build from almost the same source/object files. I tried to fix this once
but this is not easy. I am going to do that when current patch series is
applied. After that xen.efi will be loadable by three boot protocols.
Additionally, there is a chance that this way we will drop dependency
on specific binutils version.

Daniel

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