From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: 2.6.24.*/2.6.25.*: attempt to access beyond end of device
Date: Mon, 12 May 2008 10:59:42 +0100
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References: <4827D626.50903@aon.at>
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To: Peter Klotz <peter.klotz@aon.at>
Cc: linux-ide@vger.kernel.org

> I tracked the problem down to this difference in the dmesg output of the 
> bootup sequences:
> 
> 2.6.24-16.30 (Ubuntu 8.04):
> 
>   ata1.00: HPA unlocked: 268435455 -> 312581808, native 312581808
>   ata1.00: ATA-8: SAMSUNG HM160HC, LQ100-10, max UDMA/100
>   ata1.00: 312581808 sectors, multi 16: LBA48
> 
> 2.6.24.7:
> 
>   ata1.00: HPA detected: current 268435455, native 312581808
>   ata1.00: ATA-8: SAMSUNG HM160HC, LQ100-10, max UDMA/100
>   ata1.00: 268435455 sectors, multi 16: LBA48

Your Ubuntu kernel is clearing the host protected area (the BIOS has
marked the end part of the disk as 'reserved' - probably for an XP
restore partition), the base one for some reason is not.

Set the boot option "libata.ignore_hpa=1". That defaults to zero
(respecting the BIOS) so that users don't accidentally blow away BIOS
partitions and restore images, except apparently Ubuntu patch it the
other way by default.

Alan