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

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Message-ID: <47658063.5010707@googlemail.com>
Date:	Sun, 16 Dec 2007 20:45:39 +0100
From:	Gabriel C <nix.or.die@...glemail.com>
To:	Oliver Joa <oliver@...-a.de>
CC:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: How to Switch DMA off for only one Harddisk at Kernelboot

Oliver Joa wrote:
> Hi,
> 
> Gabriel C wrote:
>> 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 )
> 
> I tried this already, it does not work.
> 
>> Also have a look at Documentation/ide.txt.
> 
> I read this already. Searching for "nodma" in this document gives only 
> one line:
> 
>   "ide=nodma"            : disable DMA globally for the IDE subsystem.
> 
> If the documentation is correct hda=nodma and ideX=nodma should not 
> work. I use kernel 2.6.23.1 at the moment.

grep nodma Documentation/ide.txt
 "hdx=nodma"            : disallow DMA

ide=foo_option is for the whole ide sub-system where ideX|hdX=foo_option is just for that HDD.

Anyway I've CC'ed linux-ide.

> 
> Thanks
> 
> Olli
> 


Gabriel
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