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

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Date:	Fri, 14 Aug 2009 14:18:08 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: How to disable DMA for compact-flash disk?

On 08/14/2009 02:10 PM, Alan Cox wrote:
>> This worked fine, but now I'm having some more issues.  Using libata is 1/2
>> as fast as using IDE mode.  I *think* the problem might be that libsata
>> may not be using 32-bit PIO mode, but I'm not certain of that.  It seems
>> that ide mode uses PIO2 v/s PIO4 for libsata too.
>
> As of 2.6.29 libata doesn't use 32bit PIO (it shouldn't make a difference
> for most chipsets but it does for some). 2.6.30 does for some and you can
> turn it on for others if you want to test by inheriting
> ata_bmdma32_port_ops instead of ata_bmdma_port_ops

Can you give me a clue as to what code needs poking?  I'm working
on the latest 31-rc5 tree, btw.

PS.  Can't get an ide based 2.6.31-rc5 kernel to boot in F11, though it doesn't seem
to be related to ide.  I probably have something wrong in my .config.

Thanks,
ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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