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Message-ID: <47658235.7050409@j-o-a.de>
Date: Sun, 16 Dec 2007 20:53:25 +0100
From: Oliver Joa <oliver@j-o-a.de>
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To: Gabriel C <nix.or.die@googlemail.com>
Cc: linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org
Subject: Re: How to Switch DMA off for only one Harddisk at Kernelboot
References: <4765690C.6010605@j-o-a.de> <47657BA8.3020004@googlemail.com> <47657D79.7090100@j-o-a.de> <47658063.5010707@googlemail.com>
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Hi,

Gabriel C wrote:

[...]

>>> 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.


/usr/src/linux-2.6.23.1$ grep nodma Documentation/ide.txt
  "ide=nodma"            : disable DMA globally for the IDE subsystem.

/usr/src/linux-2.6.21.5$ grep nodma Documentation/ide.txt
  "ide=nodma"            : disable DMA globally for the IDE subsystem.

/usr/src/linux-2.6.12# grep nodma Documentation/ide.txt
  "ide=nodma"            : disable DMA globally for the IDE subsystem.

Sorry, but I can not find this option, and it does not work. Which 
kernel do you use?

Thanks

Olli