Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932972Ab1CWPQO (ORCPT ); Wed, 23 Mar 2011 11:16:14 -0400 Received: from ironport2-out.teksavvy.com ([206.248.154.181]:36482 "EHLO ironport2-out.pppoe.ca" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755570Ab1CWPQN (ORCPT ); Wed, 23 Mar 2011 11:16:13 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApIBABariU1Ld/sX/2dsb2JhbAAMhDjVSJBigSeBWIFzdwSZPw X-IronPort-AV: E=Sophos;i="4.63,231,1299474000"; d="scan'208";a="97702680" Message-ID: <4D8A0EBA.6060202@teksavvy.com> Date: Wed, 23 Mar 2011 11:16:10 -0400 From: Mark Lord User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9 MIME-Version: 1.0 To: Alan Stern CC: Herbert Poetzl , linux-kernel@vger.kernel.org, Bernhard Kaindl , Andi Kleen , linux-usb@vger.kernel.org Subject: Re: debugging a modern laptop ... References: In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1177 Lines: 32 On 11-03-23 11:04 AM, Alan Stern wrote: > On Wed, 23 Mar 2011, Herbert Poetzl wrote: > >> >> Greetings! >> >> I'm trying to evaluate my options on debugging a recent >> laptop/notebook/table (and the Linux kernel on it of course) >> from early bootup to diagnostics when the machine has locked up ... .. > There _is_ support for a USB console (see CONFIG_USB_SERIAL_CONSOLE). > However it may not be useful for diagnosing problems during boot, > because obviously the console won't operate until the USB stack is in > place and running. .. If you are lucky enough to have an ExpressCard slot on the notebook, then lots of eBay sellers offer "Oxford chipset" serial/parallel ports in ExpressCard format. These provide "true" bus serial ports, which can be used as Linux consoles for low level kernel debugging, logs, panics, etc.. As a bonus, he parallel ports from the same chips can be used for homebrew JTAG adapters. -ml -- 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/