linux-kernel - Re: How to disable DMA for compact-flash disk?

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Message-ID: <20090811201206.14556624@lxorguk.ukuu.org.uk>
Date:	Tue, 11 Aug 2009 20:12:06 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ben Greear <greearb@...delatech.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: How to disable DMA for compact-flash disk?

On Tue, 11 Aug 2009 11:51:18 -0700
Ben Greear <greearb@...delatech.com> wrote:

> I'm trying to use Fedora 11 with default kernel on an old via system
> that boots from compact flash.  DMA is not supported on the CF for
> whatever reason, and in previous kernels, I've always disabled
> DMA, first with ide=nodma, and then later with
> ide_core.nodma=0.0 ide_core.nodma=0.1 ...

Fedora switched to libata some releases ago so

libata.dma=n

0 - off
1 - disk only

+ 2 disk/CD
+ 4 disk/CD/CFA

(so you can turn DMA off just for CFA devices providing they admit they
are CFA)

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