Re: SCSI disc hangs -> A solution

[Christoph Plattner]

Hello,

thanks for the answers.

I think it is correct now. IMO you have to define the correct
ID of the boot drive. The search order on boot devices is IMO
not fixed in define in the SCSI spec. For example IBM Unix
machines defaults booting on ID=6, Sun machines have the label
`disk' (default) defined to ID=3, the PC defaults to ID=0.

Only setting the correct boot ID, the BIOS maps this drive
as 0x80 into it's device map, and GRUB can boot correctly.

By the way: Using mixed IDE/SCSI setups, the /boot/grub/device.map
file is important, so that GRUB running on the UNIX shell knows,
which drive is which one on BIOS level.

As GRUB patches it's own files to define the deices to load,
such an error you reported can happen.

You specifiy to install GRUB to disk B, which becomes disk A
on boot then. So GRUB writes to disk B that GRUB is on disk B.

On the boot then, disk B is disk A and the first GRUB file is
loaded. But this file defines, that GRUB is installed to disk
B, but there is no GRUB, so it hangs or reports errors !
This is a simplified explanation ....

Bye
Christoph P.


stellan alm wrote:
> 
> Hi again,
> Default my computer boots off the IDE disc, using SystemCommander2000.
> I have two SCSI discs on a Adaptec 2940 U2W.
> They have SCSI ID 3 and 6, I installed GRUB on the disc with ID 3.
> Then GRUB just got stuck when during the boot process.
> Default Boot device was set to ID 0 in the SCSI BIOS, after changing
> Boot Device by selecting SCSI ID 3, I got GRUB to load.
> Hopes this clarifies the former mail.
> I'll gladly answer more question if I can help.
> 
> /Stellan
> 
> On Thursday 27 June 2002 00.22, you wrote:
> > -----Ursprungligt meddelande-----
> > Fran: address@hidden [mailto:address@hidden Christoph
> > Plattner
> > Skickat: den 26 juni 2002 09:08
> > Till: stellan alm
> > Kopia: address@hidden
> > Amne: Re: SCSI disc hangs -> A solution
> >
> >
> > Hello,
> >
> > Can you give some more details on this point ?
> >
> > What means, you changed the boot drive ?
> > Do you mean, you boot now from another ID than 0 ?
> >
> > Give some details on IDs of the SCSI disks, details on the
> > IDE (pri/sec master/slave) and on the BOOT order in the BIOS
> > IDE/SCSI or other....
> >
> > From which drive do you want to boot from SCSI, IDE ?
> >
> > Perhaps we can sum up here the problem...
> >
> > Christoph P.
> >
> > stellan alm wrote:
> > > Hi,
> > > I've been setting upp my computer with the Gentoo dist.
> > > My computer has a Adaptec-2940U2W card, with two drives and a single IDE
> > > drive.
> > > I installed GRUB on my first SCSI disc, but it kept on getting stuck just
> > > printing
> > > "GRUB" to stdout. I disabled the INT13(LBA) stuff in my SCSI BIOS, but it
> > > got even
> > > more peculiar...
> > > After several retries I changed the Boot Device in the SCSI BIOS(Ctrl-A)
> >
> > to
> >
> > > the
> > > disc containing GRUB and VOILA !
> > > So by changing the boot drive I got GRUB to boot, PUH ! :-)
> > >
> > > Couldn't see any posting about this so, this should probably fit in to
> > > the FAQ.
> > >
> > > Kind regards,
> > > Stellan Alm <address@hidden>
> > >
> > > _______________________________________________
> > > Bug-grub mailing list
> > > address@hidden
> > > http://mail.gnu.org/mailman/listinfo/bug-grub
> >
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