From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965356AbcKLLfr (ORCPT ); Sat, 12 Nov 2016 06:35:47 -0500 Received: from Galois.linutronix.de ([146.0.238.70]:37058 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932182AbcKLLfp (ORCPT ); Sat, 12 Nov 2016 06:35:45 -0500 Date: Sat, 12 Nov 2016 12:32:58 +0100 (CET) From: Thomas Gleixner To: Lu Baolu cc: Peter Zijlstra , Greg Kroah-Hartman , Mathias Nyman , Ingo Molnar , linux-usb@vger.kernel.org, x86@kernel.org, LKML Subject: Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug capability In-Reply-To: <5826C626.4010600@linux.intel.com> Message-ID: References: <1477976354-13291-1-git-send-email-baolu.lu@linux.intel.com> <1477976354-13291-2-git-send-email-baolu.lu@linux.intel.com> <5823CB63.7090603@linux.intel.com> <20161110114445.GW3142@twins.programming.kicks-ass.net> <58254A19.8030003@linux.intel.com> <20161111122824.GH3117@twins.programming.kicks-ass.net> <5826C626.4010600@linux.intel.com> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 12 Nov 2016, Lu Baolu wrote: > On 11/11/2016 08:28 PM, Peter Zijlstra wrote: > > Again, a UART rules. Make a virtual UART in hardware, that'd be totally > > awesome. This thing, I'm not convinced its worth having. > > This is the initial work. It helps at least in cases where people need > to dump kernel messages but lacking of a console. It's also a cheap > way, people don't need to buy any third-party devices. > > With more and more people trying and enhancing it, it will become > more robust and helpful. Well, not really. The hardware does not allow you what an UART allows you to do and never will, no matter how many people are trying to enhance the software part of it. Thanks, tglx