Re: ATAPI Driver problems

[Robert Millan]

On Thu, Oct 09, 2008 at 12:23:25PM +0200, Clemens Helfmeier wrote:
> Hi everybody,
> 
> I am trying to access the qemu cdrom drive (atapi) with grub2. Unfortunately, 
> qemu crashes with "triple faults". A bit of google revealed that this would 
> also 
> reboot a real machine, so qemu has reasons for it.
> 
> This always happens at the same location of code (0xb3a0 in my case) but the 
> output bofore the crash is not always the same. I don't know if output is 
> delayed either in qemu or in grub, does anyone know that?
> 
> I also wonder why the qemu cdrom drive is not detected as removable nor as 
> cdrom 
> drive:
> 
> grub> ls (ata2)/
> ../disk/ata.c:798: opened device ata0 successfully.
> ../disk/ata.c:803: using block size 0x200 for device ata0.
> ../disk/ata.c:816: closed device ata0,1.
> ../disk/ata.c:920: opening ATAPI dev `ata2'
> ../disk/scsi.c:261: dev opened
> ../disk/scsi.c:270: inquiry: devtype=0x00 removable=0
> qemu: fatal: triple fault

This code is known to work on qemu AFAIK.  Is that pristine SVN, or your patched
version?

> How can i debug the running grub2 in the qemu machine? Is there an easy way 
> with 
> gdb? Did someone already get the ATAPI code working somehow? Where can i find 
> information on how to access atapi/ata drives?

The wiki has some info on that IIRC

-- 
Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
  how) you may access your data; but nobody's threatening your freedom: we
  still allow you to remove your data and not access it at all."