Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755538AbZCEHCU (ORCPT ); Thu, 5 Mar 2009 02:02:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752925AbZCEHCH (ORCPT ); Thu, 5 Mar 2009 02:02:07 -0500 Received: from mx1.suse.de ([195.135.220.2]:35836 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750786AbZCEHCE (ORCPT ); Thu, 5 Mar 2009 02:02:04 -0500 Date: Wed, 4 Mar 2009 18:06:17 -0800 From: Greg KH To: Alan Stern Cc: "Eric W. Biederman" , Ingo Molnar , Randy Dunlap , Yinghai Lu , Sarah Sharp , linux-usb@vger.kernel.org, Linux Kernel Mailing List , Andrew Morton Subject: Re: EHCI debug documentation Message-ID: <20090305020617.GA2812@suse.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.16 (2007-06-09) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1607 Lines: 37 On Wed, Mar 04, 2009 at 04:59:28PM -0500, Alan Stern wrote: > On Wed, 4 Mar 2009, Eric W. Biederman wrote: > > > Greg KH writes: > > > > > * Randy Dunlap wrote: > > >> Yinghai Lu wrote: > > >> > b. netchip USB debug cable > > >> > > >> http://www.plxtech.com/products/NET2000/NET20DC/default.asp > > > > > > I have reports that the newer version of this device does not work on > > > Linux as it isn't enumeratable as a "real" usb device on one end. > > > > > > I don't have one of these new devices yet to test it out, has anyone > > > else heard of this problem? > > > > With the first generation of devices I remember they were peculiar and > > finicky. I don't recall the exact details but I remember the devices > > able to get into weird states that may resemble what you describe. > > Those devices were a little peculiar in that they were powered only on > one side. That is, they would take bus power only from the right-hand > connector (looking at the face with the PLX logo). So if you plugged > in only the left side, the device would not show up or enumerate. But > if you plugged in both sides, then both of them would enumerate okay. Thanks for the information, I'll try to get the person that reported this to retest and see if both sides plugged in at the same time works better. greg k-h -- 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/