[SeaBIOS] doe's seabios support retry booting from other disk if boot from one disk failed
kevin at koconnor.net
Mon Oct 29 12:17:00 CET 2012
On Mon, Oct 29, 2012 at 09:32:04AM +0100, Gerd Hoffmann wrote:
> On 10/28/12 02:06, Kevin O'Connor wrote:
> > On Fri, Oct 19, 2012 at 03:52:04PM +0800, Eli wrote:
> >> hi all:
> >> Does anyone know that if seabiso support booting from other disk if boot
> >> from one failed ?
> >> For instance, the PC BIOS boot specification allows only one
> >> disk to be bootable. If boot from disk fails for some reason, the BIOS
> >> won't retry booting from other disk. It still can try to boot from
> >> floppy or net, though.I want to know that if seabios support retry booting from other disk?
> > SeaBIOS follows the specifications, and so only the C drive can be
> > booted. Unfortunately, once the C drive is assigned it can't be
> > changed reliably. So, ultimately SeaBIOS has the same limitation as
> > other BIOS here.
> What is the problem here? Fall back to ide/sata hard disk when booting
> from usb stick (which is treated as hard disk too) failed would be useful.
> It certainly would be a non-trivial change to the boot order code as
> this would involve changing the disk mapping, rewriting edd tables and
> maybe more.
> But on a quick glance I can't see why it wouldn't work reliably.
There's no way to remap a drive configured via an option rom. It is
technically possible to remap the drives if only SeaBIOS internal
drivers are used, but the moment one has a drive configured via an
option rom the behavior will change subtly. Technically, it's
probably possible to do a complete reboot to change boot order even
with option roms, but I suspect that would also lead to subtle corner
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