Re: [Qemu-devel] Boot order problem

[Gleb Natapov]

On Mon, Jul 25, 2011 at 04:44:58PM +0900, Minoru Usui wrote:
> On Sun, 24 Jul 2011 09:30:49 +0300
> Gleb Natapov <address@hidden> wrote:
> 
[skip]

> I tested another one about <boot order> case on RHEL6.1, and I also faced 
> another problem.
> 
> VM has two virtio HDD. HDD1 is installed RHEL6.1, HDD2 is empty.
> I specified boot order to HDD1:1, HDD2:2, VM booted up from HDD1,
> but boot order HDD1:2, HDD2:1 case, VM couldn't boot up from HDD2.
> (It searched CD-ROM, NIC(gPXE), and finally stopped booting.)
> 
That's BIOS specification limitation. BIOS can't fall back from one HDD
to another, so only HDD with lowest priority among all HDDs will be tried.
 
> It seems seabios searches only 1 device per device list(HDD, CD-ROM, NET, 
> FLOPPY).
> Is it true?
No, it searches only one HDD. Other devices do not have this limitation
IIRC.

> 
> <boot order> can specify per device, so shouldn't seabios search all device,
> even if it specifies multiple device per device list?
> 
> -- 
> Minoru Usui <address@hidden>

--
                        Gleb.