From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: ata1.00: failed to IDENTIFY (I/O error, err_mask=0x4)
Date: Sat, 23 Feb 2008 18:31:38 +0000
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To: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Jeff Garzik <jgarzik@pobox.com>, linux-ide@vger.kernel.org, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>

O> I don't see the connection between (no-)smp and ata. Something with
> interrupt routing/IPI, missing irq ack? Booting another !SMP kernel
> works fine. The problem also exists in 2.6.24-rc2.

Almost certainly interrupt routing try smp but with noapic and see if it
fails as well ?