linux-kernel - Re: ICH Intel PATA short cable override...

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Message-ID: <20070905061237.GC6882@pazke.donpac.ru>
Date:	Wed, 5 Sep 2007 10:12:37 +0400
From:	Andrey Panin <pazke@...pac.ru>
To:	Daniel J Blueman <daniel.blueman@...il.com>
Cc:	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...

On 247, 09 04, 2007 at 01:37:22PM +0100, Daniel J Blueman 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.

If this board has useful DMI information, you can add DMI quirk for it.
You can look at pata_via.c or pata_ali.c for example.

> Do you suggest I cook a patch to pass a kernel argument eg 'ich=short'
> or 'pata=short', or can you think of a better mechanism?
> 
> Thanks,
>   Daniel
> 
> --- [1]
> 
> # lspci -vs 00:1f.2
> 00:1f.2 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E)
> SATA IDE Controller (rev 03) (prog-if 80 [Master])
>         Subsystem: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA
> IDE Controller
> 
> # lspci -vns 00:1f.2
> 00:1f.2 0101: 8086:2828 (rev 03) (prog-if 80 [Master])
>         Subsystem: 8086:2828
> -- 
> Daniel J Blueman
> -
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-- 
Andrey Panin		| Linux and UNIX system administrator
pazke@...pac.ru		| PGP key: wwwkeys.pgp.net

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