From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932108AbVLIPNx (ORCPT ); Fri, 9 Dec 2005 10:13:53 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932203AbVLIPNx (ORCPT ); Fri, 9 Dec 2005 10:13:53 -0500 Received: from nevyn.them.org ([66.93.172.17]:21184 "EHLO nevyn.them.org") by vger.kernel.org with ESMTP id S932108AbVLIPNx (ORCPT ); Fri, 9 Dec 2005 10:13:53 -0500 Date: Fri, 9 Dec 2005 10:13:48 -0500 From: Daniel Jacobowitz To: Olaf Hering Cc: Andrew Morton , linux-kernel@vger.kernel.org, Sachin Sant Subject: Re: [PATCH] Adding ctrl-o sysrq hack support to 8250 driver Message-ID: <20051209151348.GA12815@nevyn.them.org> Mail-Followup-To: Olaf Hering , Andrew Morton , linux-kernel@vger.kernel.org, Sachin Sant References: <20051209140559.GA23868@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20051209140559.GA23868@suse.de> User-Agent: Mutt/1.5.8i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 09, 2005 at 03:05:59PM +0100, Olaf Hering wrote: > > If you can queue this up in -mm for a decade or two, just to make sure > it doesnt make some setup unhappy. > > > a POWER4 system in 'full-system-partition' mode has the console device > on ttyS0. But the user interface to the Linux system console may still > be on the hardware management console (HMC). If this is the case, there > is no way to send a break to trigger a sysrq. > Other setups do already use 'ctrl o' to trigger sysrq. This includes iSeries > virtual console on tty1, and pSeries LPAR console on hvc0 or hvsi0. > > 'ctrl o' is currently mapped to 'flush output', see 'stty -a' And... you're going to make it impossible to run ppp over the serial console port. For everyone, not just your big POWER4 boxes. As far as I know, if you turn off the printk log level, this should work just fine today. -- Daniel Jacobowitz CodeSourcery, LLC