linux-kernel - Re: [BUG] IT8212 libata driver *still* hard-freezes system on boot on 2.6.22 final.

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Date:	Mon, 9 Jul 2007 10:49:30 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Rodney Gordon II <meff@...erevision.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Tejun Heo <htejun@...il.com>
Subject: Re: [BUG] IT8212 libata driver *still* hard-freezes system on boot
 on 2.6.22 final.

On Sun, 08 Jul 2007 20:23:24 -0500
Rodney Gordon II <meff@...erevision.org> wrote:

> Have been quite busy, and I regret I haven't tried a rc kernel in
> awhile, but, this bug has gone un-fixed still.. Thought I'd throw in
> another "heads up"..
> 
> 2.6.22 hang: http://spherevision.org/sync/visual/itelock.jpg
> lspci -vvv: http://spherevision.org/sync/tmp/lspci.out
> 
> Pentium-D 830 3.0GHz Dualcore on a ASUS P5LD2 with latest bios rev.
> 1804.
> 
> SysRq does not work when this locks up.
> 
> Patches, info, things to try, anything is welcome, I am available for
> awhile now and will try anything to get this working.

I'm at a bit of a loss on this one I'm afraid - it seems to be specific
to a couple of boards and every IT821x box I can lay my paws on works
beautifully.

It would be useful to know if a kernel built with no DMA support for the
IT8212 behaved as that might give us a clue about what is choking. If you
look in drivers/ata/pata_it821x.c:it821x_init_one you'll see a pair of
lines that say

	mwdma = 0x1f,
	udma_mask = 0x7f


remove, rebuild and report..

Thanks
Alan
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