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

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Date:	Tue, 18 Dec 2007 00:44:09 +0100
From:	Oliver Joa <oliver@...-a.de>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: How to Switch DMA off for only one Harddisk at Kernelboot

Hi,

Lennart Sorensen wrote:

[...]

> Isn't it more a matter of having a CF card that does do DMA and a
> controller that does DMA, but a CF to IDE adapter that does not do DMA?
> 
> If it is really a case of a CF card that claims to do DMA but is
> unstable if you try (I have found one model that does so), then it
> should simply be added to the ide dma blacklist instead.

Maybe I will try this also, but for the moment it is running.

> I blacklisted 'SMART CF' on my system since they have random read errors
> and other i/o errors whenever DMA is enabled (while other cards work
> fine with DMA enabled).  They claim to do DMA, but sure don't seem to do
> so reliably on this system.  SiliconDrive CF works perfectly with DMA on
> the same system.

It is working now with "hda=nodma" on kernel 2.6.24-rc5. Thanks to 
Bartlomiej Zolnierkiewicz who gave me the hint to use the newest kernel.

Thanks to all.

Olli
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