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

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Message-Id: <1183979782.4301.4.camel@ghreen.sphere>
Date:	Mon, 09 Jul 2007 06:16:22 -0500
From:	Rodney Gordon II <meff@...erevision.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Tejun Heo <htejun@...il.com>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: Re: [BUG] IT8212 libata driver *still* hard-freezes system on boot
	on 2.6.22 final.

On Mon, 2007-07-09 at 10:49 +0100, Alan Cox wrote:
> 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..

Alright.

Attachment [0] is a successful boot with those lines removed. (This a
good thing or a bad thing? :)

Attachment [1] is a successful boot with the old ata subsystem using the
IT8212.

Hope this helps.

-r

View attachment "dmesg.workinglibata" of type "text/plain" (22648 bytes)

View attachment "dmesg.oldlayer" of type "text/plain" (21968 bytes)