From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [patch]Add a new reboot method
Date: Thu, 29 May 2008 12:49:14 +0100
Message-ID: <20080529124914.043ed6fb@core>
References: <42DFA526FC41B1429CE7279EF83C6BDC01383B57@pdsmsx415.ccr.corp.intel.com>
	<20080529112645.7dfbd32e@core> <483EA803.76E4.0078.0@novell.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <483EA803.76E4.0078.0@novell.com>
List-Unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Jan Beulich <jbeulich@novell.com>
Cc: xen-devel@lists.xensource.com, Huacai Chen <huacai.chen@intel.com>, Keir Fraser <keir.fraser@eu.citrix.com>
List-Id: xen-devel@lists.xenproject.org

> to be affected: Linux post 2.6.22 (iirc) fails to reboot my Dell Precision
> 490 correctly, I have to force it to use the CF9 method. I tried looking
> into the changes that got made in that area, but wasn't able to (spend
> enough time to) pin-point the problem so far.

You might want to boot a 32bit kernel and try acpi=off, if that does the
trick then its (another) ACPI bug and the cf9 is red herring ?

> But I also agree to you and Keir that blindly writing to a port is no good
> idea. It should at least be assured that hardware supports this.

Which takes us back to ACPI. If 0xcf9 is the correct process the ACPI
method should use it.