Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755976AbZCDWzj (ORCPT ); Wed, 4 Mar 2009 17:55:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752845AbZCDWz3 (ORCPT ); Wed, 4 Mar 2009 17:55:29 -0500 Received: from mga03.intel.com ([143.182.124.21]:49726 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752681AbZCDWz2 (ORCPT ); Wed, 4 Mar 2009 17:55:28 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.38,303,1233561600"; d="scan'208";a="116840818" Date: Wed, 4 Mar 2009 14:55:00 -0800 From: Sarah Sharp To: Yinghai Lu Cc: "Eric W. Biederman" , Greg KH , Ingo Molnar , Randy Dunlap , linux-usb@vger.kernel.org, Alan Stern , Linux Kernel Mailing List , Andrew Morton Subject: Re: EHCI debug documentation Message-ID: <20090304225500.GB13509@gamba.jf.intel.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17+20080114 (2008-01-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1534 Lines: 35 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. That comment should be in the documentation for ehci early printks too. Sarah Sharp -- 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/