Re: grub crashes. Crash as in causes the PC to reboot.

[James Courtier-Dutton]

Hi, I have found what I think the problem is.
http://mail.gnu.org/archive/html/bug-grub/2001-08/msg00144.html

I have an "Adaptec AHA-2940", and I suspect it has the same problems as 
the "Adaptec AHA-2940UW" owned by the person who wrote that article.

I will try to find out some way for grub to auto-detect this bios, and 
therefore avoid the buggy calls.

One strange thing is that I thought that SCSI drives only used LBA, so I 
 don't know what is supposed to happen if we try to access INT13 calls 
using heads/cylinders etc.

Cheers
James


James Courtier-Dutton wrote:
> I have 2 Hard discs.
> hd0 is IDE.
> hd1 is SCSI   The SCSI controller is a very old Adaptec AHA-2940.
>
>
> After booting from a floppy containing grub: -
>
> grub> geometry (hd0)
> Displays geometry and returns to grub> prompt.
> grub> geometry (hd1)
> Displays geometry and causes an immeadiate reboot!
>
> It is only the SCSI drive that has problems.
>
> hd1 has only one primary partition, containing a FAT32 formatted 
> partition with Windows 98 on it.
>
>  From looking at the grub source code, it looks like: -
> File is stage2/builtins.c
>
> /* geometry */
> static int
> geometry_func (char *arg, int flags)
> {
>
> <snip>
>   grub_printf ("drive 0x%x: C/H/S = %d/%d/%d, "
>                "The number of sectors = %d, %s\n",
>                current_drive,
>                geom.cylinders, geom.heads, geom.sectors,
>                geom.total_sectors, msg);
>   real_open_partition (1);
>
>
>   return 0;
> }
>
>
> So, as it gets and actually prints that information from the 
> grub_printf, my guess is the problem is in real_open_partition(1).
>
> What exactly does real_open_partition(1) do, and can I remove that line 
> for test purposes?
>
> If by removing it, the geometry command works, I can then look at the 
> real_open_partition function, and add a few grub_printf's to see where 
> it reboots.
> Does grub have a "grub_pause_for_1_second" function? That would also 
> help by giving me a chance to see what is printed before the reboot.
>
> Cheers
> James
>
>
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