From: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
To: Phil Dibowitz <phil@ipom.com>
Subject: Re: Linux IDE bug in 2.4.21 and 2.4.22 ?
Date: Tue, 9 Sep 2003 14:48:36 +0200
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On Tuesday 09 of September 2003 00:51, Phil Dibowitz wrote:
> Hey folks,
>
> I think I may have found a bug in the Linux IDE subsystem
> introduced in 2.4.21 and still present in 2.4.22.

Nope, user error :-).

> SHORT SYNOPSIS: I played with various combinations of drivers, and no
> matter what I do I can only get ONE of the IDE controllers in my machine
> recognized at a time. I find this in both 2.4.21 and 2.4.22.
> Howerver, 2.4.20 and prior were NOT affected.

<...>

> Up until (and including) 2.4.20, my kernel IDE configuration has always
> looked like
>
> CONFIG_BLK_DEV_IDEDISK=y
> CONFIG_IDEDISK_MULTI_MODE=y
> CONFIG_BLK_DEV_IDECD=m
> CONFIG_BLK_DEV_IDEFLOPPY=m
> CONFIG_BLK_DEV_IDESCSI=m
> CONFIG_BLK_DEV_CMD640=y
> CONFIG_BLK_DEV_CMD640_ENHANCED=y
> CONFIG_BLK_DEV_IDEPCI=y
> CONFIG_IDEPCI_SHARE_IRQ=y
> CONFIG_BLK_DEV_IDEDMA_PCI=y
> CONFIG_IDEDMA_PCI_AUTO=y
> CONFIG_BLK_DEV_IDEDMA=y
> CONFIG_BLK_DEV_ADMA=y
> CONFIG_BLK_DEV_PIIX=y
> CONFIG_PIIX_TUNING=y
> CONFIG_IDEDMA_AUTO=y
> CONFIG_BLK_DEV_IDE_MODES=y
>
> The noteworthy thing about the above is that I'm NOT enabling CMD64X -- the
> CMD640 has always handled the CMD649 PCI IDE controller just fine.

Nope, your CMD649 was handled by generic PCI IDE driver.

> As of 2.4.21, this configuration no longer works -- which is not
> necessarily a bug. I'm almost there, stay with me. =)

Assumption that current .config will work with future kernel versions is *false*.

Just add these two lines to your .config:
CONFIG_BLK_DEV_VIA82CXXX=y
CONFIG_BLK_DEV_CMD64X=y

> So the PCI IDE card isn't recognized with the above configuration. So I decided
> to enable the CMD64X driver. This caused my PCI IDE card to be recognized BUT 
> as a side effect, my onboard controller was *NOT* recognized!! At this point
> I had built the CMD64X driver into the kernel.

Your VIA IDE controller was handled by generic IDE chipset driver which
did probe devices *after* PCI controllers are probed, so CMD649 took
ide0 and ide1 first.

--bartlomiej

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