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Date: Sat, 06 Nov 2004 13:52:11 -0800
From: Jason Brittain <jason@brittainweb.org>
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Subject: Re: [Qemu-devel] enabling bus-master IDE driver
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To: qemu-devel@nongnu.org

Johannes Schindelin wrote:
> Hi,
> 
> On Fri, 5 Nov 2004, Jason Brittain wrote:
> 
> 
>>/dev/hda:
>>  setting using_dma to 1 (on)
>>  HDIO_SET_DMA failed: Operation not permitted
>>  using_dma    =  0 (off)
> 
> Are you sure you did as guest root? This error could happen if you try to
> use hdparm as a plain user. 

I was most certainly logged in as root in the guest Linux
when I did that.

> I would expect a different error if the drive
> is not capable of doing DMA.

Well, I haven't seen other situations where drives were
incapable of DMA, so I don't know, but "Operation not
permitted" seems to fit.

How else should I check whether DMA can be turned on?

-- 
Jason Brittain