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From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
To: Oliver Joa <oliver@j-o-a.de>
Subject: Re: How to Switch DMA off for only one Harddisk at Kernelboot
Date: Mon, 17 Dec 2007 12:58:59 +0100
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Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, linux-kernel@vger.kernel.org
References: <4765690C.6010605@j-o-a.de> <20071216201643.396fa8d7@the-village.bc.nu> <47665ACE.7020907@j-o-a.de>
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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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