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From: =?ISO-8859-15?Q?Sven_K=F6hler?= <skoehler@upb.de>
Date: Fri, 05 May 2006 17:59:38 +0200
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Subject: [Qemu-devel] Re: DMA with Knoppix and qemu (cvs-version)
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> i just booted a recent knoppix-cd (4.0.2) and i'm trying to enable DMA,=

> but it won't work!
>=20
> I started qemu with that command:
>=20
> qemu -m 256 -cdrom knoppix.iso -boot d
>=20
> But inside knoppix, a "hdparm -d1 /dev/hdc" won't work:
>   HDIO_SET_DMA failed: Operation not permitted

Ah ha! DMA mode work for harrdisks, but not for cdroms.

Strange - why?


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