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

From: Jason Brittain
Subject: Re: [Qemu-devel] enabling bus-master IDE driver
Date: Sat, 06 Nov 2004 13:52:11 -0800
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20040913

Johannes Schindelin wrote:

On Fri, 5 Nov 2004, Jason Brittain wrote:

 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

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