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

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Date:	Sun, 16 Dec 2007 20:25:28 +0100
From:	Gabriel C <nix.or.die@...glemail.com>
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

Oliver Joa wrote:
> Hi,

Hi Oliver ,

> 
> 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.
> 
> Thank you very much

Should work with hda=nodma or ideX=nodma ( where X is your HDD nr , in your case is 0 )

Also have a look at Documentation/ide.txt.

> Olli

Gabriel
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