linux-kernel - Re: pata_it821x completely broken

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Message-Id: <200807222116.19077.linux@rainbow-software.org>
Date:	Tue, 22 Jul 2008 21:16:17 +0200
From:	Ondrej Zary <linux@...nbow-software.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Alan Cox <alan@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org
Subject: Re: pata_it821x completely broken

On Tuesday 22 July 2008 20:10:22 Alan Cox wrote:
> > New patch below, this time with DMA forced on RAID volumes - as my
> > firmware does not identify the RAID arrays as DMA capable :(
>
> The underlying problem is that the newer libata rewrites the dev->id data
> in ways that we can't then patch up. I've actually been hacking on this a
> bit today. The existing it821x code was working fine and it does the
> needed patching, it just needs to do it in a different place, and that in
> turn needs a new ap->ops->read_id() method so it can be hooked.

I can test the code once it's done.
I just moved my / to the RAID1 provided by IT8212. The controller has a great 
feature that allows converting a drive between RAID1/standalone without data 
loss (haven't seen anything like this yet). Also the background rebuild is 
nice (as seen on much more expensive RAID controllers), it's running as I'm 
typing this.

>
> On the bright side that also allows us to implement a pata_mfm/rll
> driver at last.
>

I used to have an old drive that was something like that - 5.25" Seagate 40MB 
drive. I sold it including the controller a couple of years ago (it was still 
working) so no testing fun for me.

> Alan

-- 
Ondrej Zary
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