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Message-ID: <58cb370e0412081346554cf3d8@mail.gmail.com>
Date: Wed, 8 Dec 2004 22:46:50 +0100
From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Reply-To: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
To: Alan Pope <alan.pope@gmail.com>
Subject: Re: PDC202XX_OLD broken
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Andre Hedrick <andre@linux-ide.org>
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On Wed, 8 Dec 2004 21:25:56 +0000, Alan Pope <alan.pope@gmail.com> wrote:
> On Tue, 7 Dec 2004 21:58:52 +0100, Bartlomiej Zolnierkiewicz
> <bzolnier@gmail.com> wrote:
> > You are using 40c cable instead of 80c one.
> > Thus transfer rate is limited to UDMA33.
> >
> 
> No, I'm using an 80c cable. I have even gone out and bought a new 80c
> one just to make sure the cable isn't broken. I have also got two
> identical disks, and experience exactly the same problem on both.

Ah, my mistake, you have 40c cable connected to VIA not Promise...

> I booted with "ide2=dma" because it was booting with the disk in pio mode.

If you are talking about:

ide3: BM-DMA at 0xd008-0xd00f, BIOS settings: hdg:pio, hdh:pio

it reports BIOS settings not the ones used by driver, no need for
"ide=dma2" if you have CONFIG_IDEDMA_PCI_AUTO=y.

> > Moreover pdc202xx_old has a bug in cable detection code.
> > pdc202xx_old_cable_detect() always returns '0' (which means
> > 80c cable) due to a sloppy coding - result of CIS & mask is
> > truncated to 8 bits although CIS holds cable info in bits 10-11.
> >
> > Does this fix work for you?
> >
> 
> Not tried it, but it wouldn't help me would it? I *do* have an 80c
> cable, and the disk does show up in dmesg as a UDMA100 disk..

It wouldn't, it must be another bug.