Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753138AbYL2TYg (ORCPT ); Mon, 29 Dec 2008 14:24:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752271AbYL2TY2 (ORCPT ); Mon, 29 Dec 2008 14:24:28 -0500 Received: from mail-in-10.arcor-online.net ([151.189.21.50]:51861 "EHLO mail-in-10.arcor-online.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752267AbYL2TY1 (ORCPT ); Mon, 29 Dec 2008 14:24:27 -0500 From: Bodo Eggert <7eggert@gmx.de> Subject: Re: > I even didn't have a backtrace. To: for.poige+linux@gmail.com, Sitsofe Wheeler , Willy Tarreau , linux-kernel@vger.kernel.org Reply-To: 7eggert@gmx.de Date: Mon, 29 Dec 2008 20:24:18 +0100 References: User-Agent: KNode/0.10.4 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7Bit Message-Id: X-be10.7eggert.dyndns.org-MailScanner-Information: See www.mailscanner.info for information X-be10.7eggert.dyndns.org-MailScanner: Found to be clean X-be10.7eggert.dyndns.org-MailScanner-From: 7eggert@gmx.de Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1504 Lines: 23 Igor Podlesny wrote: > 2008/12/29 Sitsofe Wheeler : >> Igor Podlesny wrote: >>> BTW, I wonder -- can the kernel store crash related information (if >>> any) in RAM, at certain addresses, so it can survive warm reboot and >>> get displayed "in dmesg" on the next boot? >> >> Perhaps you are thinking of kdump - http://lwn.net/Articles/108595/ ? > > Similar, but no exactly. I just thought that unlikely BIOS erases > memory content during "fast checks", so kernel diagnostic could be > left at certain addresses, probably duplicated for safety, and newly > booted kernel could check if there were something left for it in RAM. > That's simpler than kdump/kexec, the question is only whether memory > is really left intact during BIOS work, at least partly. You may want to read "ISA System Architecture By Tom Shanley, Don Anderson, John Swindle, MindShare, Inc" http://books.google.com/books?id=iXE6mwUCNWQC&pg=PA110&lpg=PA112&ots=ZH_c88LEqd&dq=post+reset+flag+0072+0040&ie=ISO-8859-1&output=htmlhttp://books.google.com/books?id=iXE6mwUCNWQC&pg=PA112&lpg=PA112&dq=post+reset+flag+0072+0040&source=web&ots=ZH_c88LEqd&sig=3EbSpcxbKrPvd1ixhysJK4AuOrA&hl=en&sa=X&oi=book_result&resnum=1&ct=result HTH. -- 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/