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

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Date:	Mon, 17 Dec 2007 12:17:34 +0100
From:	Oliver Joa <oliver@...-a.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: How to Switch DMA off for only one Harddisk at Kernelboot

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?

Thanks

Olli
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