Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756652AbZCETYa (ORCPT ); Thu, 5 Mar 2009 14:24:30 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754520AbZCETYU (ORCPT ); Thu, 5 Mar 2009 14:24:20 -0500 Received: from hera.kernel.org ([140.211.167.34]:44570 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754517AbZCETYT (ORCPT ); Thu, 5 Mar 2009 14:24:19 -0500 Message-ID: <49B02692.3000500@kernel.org> Date: Thu, 05 Mar 2009 11:22:58 -0800 From: Yinghai Lu User-Agent: Thunderbird 2.0.0.19 (X11/20081227) MIME-Version: 1.0 To: Daniel Walker CC: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, stern@rowland.harvard.edu, randy.dunlap@oracle.com, ebiederm@xmission.com, akpm@linux-foundation.org, gregkh@suse.de, tglx@linutronix.de, sarah.a.sharp@intel.com, mingo@elte.hu, linux-tip-commits@vger.kernel.org Subject: Re: [tip:x86/doc] x86/doc: mini-howto for using earlyprintk=dbgp References: <49AF18B7.4050305@kernel.org> <1236267366.5937.56.camel@desktop> In-Reply-To: <1236267366.5937.56.camel@desktop> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1512 Lines: 47 Daniel Walker wrote: > On Thu, 2009-03-05 at 10:00 +0000, Yinghai Lu wrote: > >> + >> +Mini-HOWTO for using the earlyprintk=dbgp boot option with a >> +USB2 Debug port key and a debug cable, on x86 systems. >> + >> +You need two computers, the 'USB debug key' special gadget and >> +and two USB cables, connected like this: >> + >> + [host/target] <-------> [USB debug key] <-------> [client/console] >> + >> +1. There are three specific hardware requirements: >> + >> + a.) Host/target system needs to have USB debug port capability. >> + >> + You can check this capability by looking at a 'Debug port' bit in >> + the lspci -vvv output: > > ... > >> + c.) Thirdly, you need a second client/console system with a regular USB port. > > You might want to combine a.) and c.) since there is some disconnect > between the two. c.) doesn't explicitly say a second time that the > client/console needs the debug port capability .. > > Or say > > a.) You will need two USB ports. One on the client/console system and > one one the target system. > > b.) The client/console and target USB ports must have the debug port > capability. You can check for this as follows, > > c.) ... thanks for checking it. can you submit patch to Ingo according to tip/master? YH -- 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/