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

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Date:	Sun, 16 Dec 2007 20:16:43 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Oliver Joa <oliver@...-a.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: How to Switch DMA off for only one Harddisk at Kernelboot

On Sun, 16 Dec 2007 19:06:04 +0100
Oliver Joa <oliver@...-a.de> wrote:

> Hi,
> 
> how can I tell the kernel not to probe DMA for a specific harddisk (e.g. 
> hda). My first Drive (hda) is a Compact-Flash Card which can not do DMA. 
> The kernel tries at boot to switch to DMA but fails. If I use ide=nodma, 
> the kernel boots about 2 minutes faster, but then I can not switch on 
> DMA for the second Drive (hdc) which is a normal Harddisk. Do I have to 
> live with this 2 minutes waiting time or is there another solution? I 
> did not find any kernel-parameter for this purpose.
> 
> Sorry if I ask here, but I can not find any solution, and I asked 
> already in other groups.

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

Alan
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