Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752821Ab0AEFUm (ORCPT ); Tue, 5 Jan 2010 00:20:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751713Ab0AEFUm (ORCPT ); Tue, 5 Jan 2010 00:20:42 -0500 Received: from out02.mta.xmission.com ([166.70.13.232]:33544 "EHLO out02.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751146Ab0AEFUl (ORCPT ); Tue, 5 Jan 2010 00:20:41 -0500 To: Venkappa Mala Cc: "rmk+lkml\@arm.linux.org.uk" , , Kexec Mailing List Subject: Re: Linux kernel crash dumps for ARM References: From: ebiederm@xmission.com (Eric W. Biederman) Date: Mon, 04 Jan 2010 21:20:23 -0800 In-Reply-To: (Venkappa Mala's message of "Tue\, 5 Jan 2010 10\:19\:31 +0530") Message-ID: User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-XM-SPF: eid=;;;mid=;;;hst=in01.mta.xmission.com;;;ip=76.21.114.89;;;frm=ebiederm@xmission.com;;;spf=neutral X-SA-Exim-Connect-IP: 76.21.114.89 X-SA-Exim-Mail-From: ebiederm@xmission.com X-SA-Exim-Scanned: No (on in01.mta.xmission.com); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2103 Lines: 63 Venkappa Mala writes: I have added the kexec list and corrected the lkml addresses. In principle it should not be too hard to use kexec on panic support on arm. I don't do any arm development so I don't have a clue what the status of the support is on arm. > Hi, > > With respect to "Linux kernel crash dumps for ARM", i have some doubts which are described as below. > > If the machine has crashed so badly that you cannot enter commands or > the disk is not available then you have three options :- > > (1) Hand copy the text from the screen > > (2) capture crash logs using Minicom. > > (3) save the crash data to a floppy disk or video rom or a swap partition or reserved memory. > > In the above three options, 1 & 2 are known and works as well. > > Regarding 3 option, > ---------------------------- > i would like to support for ARM11. > > As far as i know, the supported linux kernel crash dumps are > "lkcd, netdump,diskdump, mini kernel dump and kdump/kexec". > These are supported for x86 and PowerPC architectures with some constrains. > > i have some queries with respect to ARM supports, these are > > 1.) kexec is supported in latest kernels > example: 2.6.29 kernel > File: arch/arm/kernel/machine_kexec.c > > - is this working well or is there any constraints? > > 2) As per kexec supports, kexec-tool is required and this allows you to load directly > to a new kernel from the currently running one > > As from my side, i am not able to find arm implementation support in kexec-tools/crash sources. > > - is kexce-tool supported for ARM or not? > > 3) In lkcd, netdump,diskdump, mini kernel dump and kdump/kexec tools, > > - which is the best choice for ARM or are there any best crash dump tool for ARM? > > Please clarify my queries. > > Best Regards, > Venkappa Eric -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/