Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751307AbVJMMl5 (ORCPT ); Thu, 13 Oct 2005 08:41:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751513AbVJMMl5 (ORCPT ); Thu, 13 Oct 2005 08:41:57 -0400 Received: from ms-smtp-02.nyroc.rr.com ([24.24.2.56]:17042 "EHLO ms-smtp-02.nyroc.rr.com") by vger.kernel.org with ESMTP id S1751307AbVJMMl5 (ORCPT ); Thu, 13 Oct 2005 08:41:57 -0400 Date: Thu, 13 Oct 2005 08:41:43 -0400 (EDT) From: Steven Rostedt X-X-Sender: rostedt@localhost.localdomain To: Mark Knecht cc: Ingo Molnar , linux-kernel@vger.kernel.org Subject: Re: 2.6.14-rc4-rt1 - enable IRQ-off tracing causes kernel to fault at boot In-Reply-To: <5bdc1c8b0510130526k6064c640pecded9ccb0ef7dde@mail.gmail.com> Message-ID: References: <5bdc1c8b0510121000i5db112f2p642f66686fb46c57@mail.gmail.com> <20051013073029.GA12801@elte.hu> <5bdc1c8b0510130526k6064c640pecded9ccb0ef7dde@mail.gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1433 Lines: 35 On Thu, 13 Oct 2005, Mark Knecht wrote: > Guitar player doesn't do serial ports? ;-) > > OK, I've never done anything like this before, but I'm motivated so > I'll give it a shot. Hopefully I can make some headway without having > to ask too many stupid questions, such as the one that follows: > > Question: Is a 'null modem' cable just a plain serial cable, or is it > a special serial cable I need to go buy? > There's two types of "plain serial cables". A 'null modem' and a 'non null modem'. The 'null modem' cable allows for two computers connected together by their serial ports to talk to each other. This is because the 'null modem' cable crosses the wires so input connects to output and so forth. A 'non-null modem' cable is a direct straight through. So you can connect multiple 'non-null' modem cables together and it will still be a non-null modem cable. In fact you can connect one or more non-null to a null modem cable and it will still be a null modem cable (just longer). So make sure that you get a 'null modem' cable. Make sure you have the CONFIG_SERIAL_CONSOLE (or CONFIG_SERIAL_8250_CONSOLE) set. And then read Documentation/serial-console.txt -- Steve - 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/