doe's seabios support retry booting from other disk if boot from one disk failed

[Eli]

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?

Thanks Eli.

[Steve Goodrich]

I had a patch back in July that would allow this, but it did not work on the emulator (only in a coreboot build).  I'm trying to do something similar, although only if a disk is unbootable (no MBR or no bootable partition).

-- Steve G.

----- Original Message -----
From: "Eli" 
To: [e-mail]
Sent: Friday, October 19, 2012 1:52:04 AM
Subject: [SeaBIOS] doe's seabios support retry booting from other disk if boot from one disk failed

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?

Thanks Eli.

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[Kevin O'Connor]

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.

-Kevin

[Gerd Hoffmann]

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.

cheers,
  Gerd

[Kevin O'Connor]

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
cases.

-Kevin