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Date: Mon, 25 Feb 2008 15:03:17 -0500
From: Chuck Ebbert <cebbert@redhat.com>
Organization: Red Hat
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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>
Subject: Re: ata1.00: failed to IDENTIFY (I/O error, err_mask=0x4)
References: <19f34abd0802230948n3b98b7d2kd67ca9c2f8fbbd47@mail.gmail.com>
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On 02/23/2008 12:48 PM, Vegard Nossum wrote:
> 
> 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.
> 

"nosmp" disables the IO-APIC which will change interrupt handling.

If you just want to enable a single CPU, use "maxcpus=1".