From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Cc: linux-ide@vger.kernel.org
Subject: Re: [PATCH] Re: 2.4.22-rc2 ext2 filesystem corruption
Date: Mon, 03 Nov 2003 11:50:16 +1100 [thread overview]
Message-ID: <1067820616.691.42.camel@gaston> (raw)
In-Reply-To: <200310311941.31930.bzolnier@elka.pw.edu.pl>
On Sat, 2003-11-01 at 05:52, Bartlomiej Zolnierkiewicz wrote:
> [ http://www.ussg.iu.edu/hypermail/linux/kernel/0308.1/1164.html
> for people seeing this subject for the first time ]
>
> Hi,
>
> Can you try booting with "hdX=autotune" (hdX==your drive) kernel parameter?
> Promise driver is not autotuning PIO modes if (U)DMA modes are going
> to be used, but correct PIO timings are needed even if (U)DMA is used.
That reminds me of something "interesting" I found: I got Apple's code
for the Xserve PDC 20270 and 271 chips, and they just no timing at all
except on the 271 for U/DMA. They rely on the chip snooping the
SET_FEATURE command and do it all except for that later case, where
the chip fails to properly setup U/DMA timings on a 133Mhz clocked
chip.
They do also some tweaking to select which PLL is used apparently.
Ben.
next prev parent reply other threads:[~2003-11-03 0:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-31 18:52 [PATCH] Re: 2.4.22-rc2 ext2 filesystem corruption Bartlomiej Zolnierkiewicz
2003-11-03 0:50 ` Benjamin Herrenschmidt [this message]
2004-01-04 1:12 ` Martin Maney
2004-01-04 2:07 ` Bartlomiej Zolnierkiewicz
2004-01-08 16:25 ` Martin Maney
2004-01-10 23:18 ` Martin Maney
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