From owner-freebsd-current@FreeBSD.ORG  Wed Jul 21 14:41:29 2004
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 6ADCC16A4CE; Wed, 21 Jul 2004 14:41:29 +0000 (GMT)
Received: from duke.cs.duke.edu (duke.cs.duke.edu [152.3.140.1])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 136E543D5A; Wed, 21 Jul 2004 14:41:29 +0000 (GMT)
	(envelope-from gallatin@cs.duke.edu)
Received: from grasshopper.cs.duke.edu (grasshopper.cs.duke.edu
	[152.3.145.30])
	by duke.cs.duke.edu (8.12.10/8.12.10) with ESMTP id i6LEfSR0018374
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
	Wed, 21 Jul 2004 10:41:28 -0400 (EDT)
Received: (from gallatin@localhost)
	by grasshopper.cs.duke.edu (8.12.9p2/8.12.9/Submit) id i6LEfMlQ046520;
	Wed, 21 Jul 2004 10:41:22 -0400 (EDT)
	(envelope-from gallatin)
From: Andrew Gallatin <gallatin@cs.duke.edu>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-ID: <16638.32914.509773.486468@grasshopper.cs.duke.edu>
Date: Wed, 21 Jul 2004 10:41:22 -0400 (EDT)
To: Doug Rabson <dfr@nlsystems.com>
In-Reply-To: <200407182104.53221.dfr@nlsystems.com>
References: <16634.47272.768935.436137@grasshopper.cs.duke.edu>
	<200407182039.10773.dfr@nlsystems.com>
	<16634.54674.966908.540880@grasshopper.cs.duke.edu>
	<200407182104.53221.dfr@nlsystems.com>
X-Mailer: VM 6.75 under 21.1 (patch 12) "Channel Islands" XEmacs Lucid
cc: simokawa@freebsd.org
cc: freebsd-current@freebsd.org
Subject: Re: Excellent job on the firewire support!
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 21 Jul 2004 14:41:29 -0000


Doug Rabson writes:
 > Actually thats the only downside of dcons. It doesn't cut in until the 
 > firewire controller attaches. It relies on the fact that the fwohci 
 > driver allows access to physical memory from any node on the bus 
 > (implemeted in hardware so you can examine the memory of a hung 
 > machine). The dconschat program uses this feature to access the dcons 
 > ring buffers in the target machine.

Does remote access to physical memory require dcons to be loaded
on the target?

If no, assuming I had a Windows or Linux box on the firewire bus, would it be
possible to access physical memory from a different OS?

Thanks,

Drew