linux-kernel - Re: ata1.00: failed to IDENTIFY (I/O error, err

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Message-ID: <47C31F05.2070307@redhat.com>
Date:	Mon, 25 Feb 2008 15:03:17 -0500
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Vegard Nossum <vegard.nossum@...il.com>
CC:	Jeff Garzik <jgarzik@...ox.com>, linux-ide@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: ata1.00: failed to IDENTIFY (I/O error, err_mask=0x4)

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".
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