Re: [Qemu-devel] [PATCH 1.3?] multiboot: fix e801 memory map

[Paolo Bonzini]

Il 29/11/2012 20:24, Alexander Graf ha scritto:
>> > It is in hw/multiboot.c:
>> > 
>> >    stl_p(bootinfo + MBI_MEM_LOWER,   640);
> You want to remove that one then.

I wasn't sure of what happens if the multiboot option ROM is old.  Do we
support that to any extent?

> > Regarding the testcase, Xen will touch the EBDA without this patch and
> > with http://permalink.gmane.org/gmane.comp.emulators.xen.devel/144855.
> > However, SeaBIOS does not complain.
>
> I see :). Well, the patch is unintrusive enough for be ok for 1.3 IMHO.

Actually it's relatively easy to see a failure with Xen and a need to
PCI passthrough something with a bulky boot ROM; iSCSI or FC cards will
do.  You'll need both the Xen patch above, and this patch to boot
successfully.  Otherwise, it will fail to boot.

Paolo