Re: [Qemu-devel] DMA with Knoppix and qemu (cvs-version)

[andrzej zaborowski]

On 07/05/06, Jens Axboe <address@hidden> wrote:
> On Sat, May 06 2006, andrzej zaborowski wrote:
> > Hi there,
> >
> > On 05/05/06, Sven Köhler <address@hidden> wrote:
> > >Hi,
> > >
> > >i just booted a recent knoppix-cd (4.0.2) and i'm trying to enable DMA,
> > >but it won't work!
> > >
> > >I started qemu with that command:
> > >
> > >qemu -m 256 -cdrom knoppix.iso -boot d
> > >
> > >But inside knoppix, a "hdparm -d1 /dev/hdc" won't work:
> > >  HDIO_SET_DMA failed: Operation not permitted
> > >
> > Just a note: setting DMA through hdparm doesn't work on Linux since
> > tens of versions ago, it's been depreceted and you have to trust the
> > on-boot autodetection (and it works fine -- unless you didn't compile
> > the right driver in). It's the same on real machines.
>
> Nonsense, hdparm -d1 is a perfectly valid way to enable DMA on PATA
> drives post boot.

Oops, right, the documentation confirms that. I don't know why I was
thinking that.
> --
> Jens Axboe

Regards,
Andrzej
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