From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759384Ab1LOTDb (ORCPT ); Thu, 15 Dec 2011 14:03:31 -0500 Received: from out3.smtp.messagingengine.com ([66.111.4.27]:39994 "EHLO out3.smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759358Ab1LOTD2 (ORCPT ); Thu, 15 Dec 2011 14:03:28 -0500 X-Sasl-enc: t0ejs8jJZlmFezaF5yjTqCsOGmHmFldrnuih5kuo1ic0 1323975807 Date: Thu, 15 Dec 2011 11:02:32 -0800 From: Greg KH To: Peter Zijlstra Cc: Linus Torvalds , "Ted Ts'o" , Alan Cox , linux-kernel , Ingo Molnar Subject: Re: printk() vs tty_io Message-ID: <20111215190232.GE18791@kroah.com> References: <1323804803.9082.40.camel@twins> <20111214104308.14d0500c@pyramind.ukuu.org.uk> <1323860206.28489.35.camel@twins> <20111214140527.GA18080@thunk.org> <1323872631.28489.37.camel@twins> <1323943005.18942.18.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1323943005.18942.18.camel@twins> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Dec 15, 2011 at 10:56:45AM +0100, Peter Zijlstra wrote: > [ Personally I think USB serial console is insane, if you really need > something like that use the ehci-dbgp thing, that at least has a chance > of working. ] USB serial console was written on a drunken bet and the fact that it even works at all constantly amazes me. I know people use it as that's all they have access to, but for "real" debugging, you are right, you need the ehci-debug device to ensure that you really get the oops messages the system sends out. thanks, greg k-h