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

[andrzej zaborowski]

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.
> Are there some issues with qemu's DMA support and Linux?
> (qemu does have DMA support, doesn't it?)
>
>
> Greetings
>   Sven
>
>
>
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> http://lists.nongnu.org/mailman/listinfo/qemu-devel

Regards,
Andrzej
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