linux-kernel - Re: How to Switch DMA off for only one Harddisk at Kernelboot

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Date:	Mon, 17 Dec 2007 12:58:59 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Oliver Joa <oliver@...-a.de>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: How to Switch DMA off for only one Harddisk at Kernelboot

On Monday 17 December 2007, Oliver Joa wrote:
> Hi,
> 
> Alan Cox wrote:
> 
> [...]
> 
> > For the current kernel and libata you can use libata.dma=3, and it will
> > select DMA for disk (1) + CD (2) but not CF cards. With the older IDE it
> > should be sufficient to use hda=nodma
> 
> Thanks a lot, but it does not work:
> 
> If I use libata.dma=3 I get the following:
> [    0.000000] Unknown boot option `libata.dma=3': ignoring
> 
> And if I use hda=nodma:
> [    0.000000] ide_setup: hda=nodma -- BAD OPTION
> 
> I use kernel 2.6.21.5.
> 
> Any Idea?

"hdx=nodma" was added in 2.6.24-rc1, older kernels have only "ide=nodma"

Also "ide=nodma" may not work in older kernel with some buggy host drivers
(they were fixed in 2.6.24-rc1).

Bart
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