[Qemu-devel] Re: [SeaBIOS] [PATCHv2] Support for booting from virtio disks

[Kevin O'Connor]

On Tue, May 11, 2010 at 10:04:25AM +0100, Stefan Hajnoczi wrote:
> From what I can tell SeaBIOS is reading CMOS_BIOS_BOOTFLAG1 and
> CMOS_BIOS_BOOTFLAG2 from non-volatile memory.  The values index into
> bev[], which contains IPL entries (the drives).
> 
> Is the order of bev[] entries well-defined?  Is there a way for QEMU
> command-line to know that the first virtio-blk device corresponds to x
> and the IDE CD-ROM corresponds to y?

SeaBIOS arranges for bev[0] = floppy, bev[1] = hd, bev[2] = cdrom, and
bev[3] to be the first network card - it does this so that the boot
order can be read from qemu.  However, it's a pain to force this
order.

-Kevin