From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754133AbYDUE1H (ORCPT ); Mon, 21 Apr 2008 00:27:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750757AbYDUE0z (ORCPT ); Mon, 21 Apr 2008 00:26:55 -0400 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:55713 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1750747AbYDUE0y (ORCPT ); Mon, 21 Apr 2008 00:26:54 -0400 Date: Sun, 20 Apr 2008 21:26:56 -0700 (PDT) Message-Id: <20080420.212656.00878559.davem@davemloft.net> To: wmb@firmworks.com Cc: yhlu.kernel@gmail.com, dilinger@queued.net, hpa@zytor.com, ebiederm@xmission.com, mingo@elte.hu, akpm@linux-foundation.org, jfannin@gmail.com, linux-kernel@vger.kernel.org, jordan.crouse@amd.com Subject: Re: [PATCH 1/2] OLPC: Add support for calling into Open Firmware From: David Miller In-Reply-To: <480C1286.3040307@firmworks.com> References: <480C0582.9010509@firmworks.com> <86802c440804202015h2605eff7vc733874dd1f22261@mail.gmail.com> <480C1286.3040307@firmworks.com> X-Mailer: Mew version 5.2 on Emacs 22.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mitch Bradley Date: Sun, 20 Apr 2008 18:05:26 -1000 > In SPARC land, at least on SunOS and Solaris, it was very convenient for > debugging to interrupt the OS with Stop-A and use OFW to inspect the > system state. That was especially handy for live crash analysis. Dumps > are useful as far as they go, but they often fail to capture detailed > I/O device state. In most current SPARC systems, OFW is not usable and is completely forgotten right after bootup in order to accomodate LDOMs and CPU hotplug. It's a better idea, anyways, to develop more pervasive and usable in-kernel debugger facilities. Then it doesn't matter if you have "cool" firmware or not. :-)