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

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Date:	Sat, 29 Dec 2007 14:50:15 +0300
From:	"Konstantin A. Lepikhov" <lakostis@...afe.ru>
To:	Gabriel C <nix.or.die@...glemail.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: How to Switch DMA off for only one Harddisk at Kernelboot

Hi Gabriel!

Sunday 16, at 09:31:17 PM you wrote:

> Oliver Joa wrote:
> > 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?
> 
> This is my devel box , running 2.6.24-rc5-git
Are you using modular or in-kernel IDE? Modules ignore cmdline options, so
you must pass this parameter directly to ide_core (e.g. ide_core
options="ide=nodma").

-- 
WBR et al.
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