Re: [Qemu-devel] enabling bus-master IDE driver

[Jens Axboe]

On Thu, Nov 11 2004, Jens Axboe wrote:
> On Thu, Nov 11 2004, Jason Brittain wrote:
> > Jens Axboe wrote:
> > >On Thu, Nov 11 2004, Jason Brittain wrote:
> > >
> > >>I just pulled the latest source from CVS (today's), and tried
> > >>looking at DMA again.
> > >>
> > >>Host: Linux 2.6 (Fedora Core 2)
> > >>Guest: XP corp.
> > >>It still says the primary IDE channel is in PIO mode, and
> > >>doesn't seem any faster.
> > >>
> > >>Host: Linux 2.6 (Fedora Core 2)
> > >>Guest: Linux 2.6
> > >>hdparm now reports that DMA is on for /dev/hda, and I can also
> > >>turn it on and off.  With it on, it's about twice as fast as
> > >>it is with it off.  So, this seems to work.
> > >
> > >
> > >If I could install XP, I could take a look. But it will boot for me
> > >after install, just hangs. If I restart qemu, it complains about a bad
> > >boot loader.
> > >
> > >If I get time I'll look into this.
> > 
> > That's a known problem that aparently still isn't fixed in CVS.
> > To fix it, apply this patch to your ide.c:
> > 
> > --- hw/ide.c-bad    2004-11-11 07:54:34.000000000 -0800
> > +++ hw/ide.c   2004-11-11 08:56:23.000000000 -0800
> > @@ -1895,7 +1895,7 @@
> >                      s->heads = 16;
> >                      s->sectors = 63;
> >                  }
> > -                bdrv_set_geometry_hint(s->bs, s->cylinders, s->heads, 
> > s->sectors);
> > +                /*bdrv_set_geometry_hint(s->bs, s->cylinders, s->heads, 
> > s->sectors);*/
> >              }
> >              if (bdrv_get_type_hint(s->bs) == BDRV_TYPE_CDROM) {
> >                  s->is_cdrom = 1;
> > 
> > And, then you must reinstall XP in a new hd image.  Old images
> > are apparently corrupted, and will not work even with a patched
> > qemu binary.  I now keep my qemu patched this way and my XP
> > boots fine.
> 
> Ah thanks, I'll apply the fix and attempt a new install.

XP now installs, but gives me a license warning on the first boot.
Something like 'An error has prevented windows from verifying the
correctness of the license - error code 0x800703e6'

-- 
Jens Axboe