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Message-ID: <46DF63F8.8070805@rtr.ca>
Date: Wed, 05 Sep 2007 22:20:40 -0400
From: Mark Lord <liml@....ca>
To: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: Daniel J Blueman <daniel.blueman@...il.com>,
Tejun Heo <htejun@...il.com>, jgarzik@...ox.com,
linux-ide@...r.kernel.org,
Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: ICH Intel PATA short cable override...
Alan Cox wrote:
> On Tue, 4 Sep 2007 13:37:22 +0100
> "Daniel J Blueman" <daniel.blueman@...il.com> wrote:
>
>> We see that in ata_piix.c, there is a whitelist for (laptop) Intel ICH
>> controllers with short cables, tied to specific vendor subsystem IDs.
>> Since my mini-ITX Ibase MI910F has the subsystem IDs specified as
>> Intel [1], this is unusable.
>>
>> I can't find another existing mechanism to add short cable
>> information, to allow UDMA/66 for my on-board CF socket.
>
> DMI is the other approach (if your box has sane responses to the
> dmidecode command we can do this).
No, something more flexible is needed here.
For example, I have a Mini-ITX server here, which I personally have
equipped with a 3" 40W IDE cable that connects to a notebook drive.
The system currently uses UDMA just fine with the IDE drivers,
but I have not been able to convert it to use the (stock) libata drivers
because of this silly lack of end-user control.
We really need an override for this -- embedded folks would also apprecaate one.
Ditto for selecting transfer modes.
Cheers
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