From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Lord <liml@rtr.ca>
Subject: Re: 2.6.20 libata cdrom
Date: Tue, 01 May 2007 08:54:11 -0400
Message-ID: <46373873.6060704@rtr.ca>
References: <20070427175205.GD7809@electro-mechanical.com> <4635C35D.1020807@gmail.com> <20070430202107.GF5942@electro-mechanical.com> <4636C2C7.8090206@gmail.com>
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To: Tejun Heo <htejun@gmail.com>
Cc: William Thompson <wt@electro-mechanical.com>, linux-kernel@vger.kernel.org, IDE/ATA development list <linux-ide@vger.kernel.org>, albertcc@tw.ibm.com

Tejun Heo wrote:
..
>>>> scsi1 : ata_piix
>>>> ata2.00: failed to IDENTIFY (I/O error, err_mask=0x1)
..
> The err_mask is AC_ERR_DEV indicating that the device raised aborted the
> IDENTIFY command.  I wonder what's going on.
> 
> Can you change "#undef ATA_DEBUG" in include/linux/libata.h to "#define
> ATA_DEBUG" and report the resulting dmesg?  There will be a LOT of
> messages so you probably want to increase printk buffer size and detach
> other devices if possible.  It would be best if your root device isn't
> driven by libata so that you can just insert the module and store the
> resulting dmesg.

If the command really was "IDENTIFY", then of course it failed.
This is an ATAPI device, and it wants "PACKET_IDENTIFY".

Maybe libata somehow thinks it's ATA rather than ATAPI?