From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762007AbYCCTHu (ORCPT ); Mon, 3 Mar 2008 14:07:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755165AbYCCTHk (ORCPT ); Mon, 3 Mar 2008 14:07:40 -0500 Received: from smtp109.sbc.mail.mud.yahoo.com ([68.142.198.208]:42056 "HELO smtp109.sbc.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1754664AbYCCTHj (ORCPT ); Mon, 3 Mar 2008 14:07:39 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=pacbell.net; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:From:To:Subject:Date:User-Agent:Cc:References:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Content-Disposition:Message-Id; b=sdEidblnmVGGl90TwA9zHvxaGCmqwiM07FQrrvwuoVx/Xa03AJXeiSoVul/6K+90zOJEvhzHtrr/nkkOwoHm9NwWHa6+Rq85QqlJ8q7DriarfZf5HPcsup8Hk9N2ja48ZQEbLzNoeBhKCz9REXpGsXCxJvvkxz4Q0WREb9X5svE= ; X-YMail-OSG: tKJ2ID8VM1mD35dhUmbxpY1t5hrPqOv3PEbcQIoA3CzSwELK2vuUx8R6XKxR8tEsMPbrU70Uhg-- X-Yahoo-Newman-Property: ymail-3 From: David Brownell To: "mahendra varman" Subject: Re: usb detecting only high speed devices only - not detecting low speed devices Date: Mon, 3 Mar 2008 11:07:36 -0800 User-Agent: KMail/1.9.6 Cc: "Andrew Morton" , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org References: <4ac2955e0802260543n7d7e5d81nb590d2bc10648269@mail.gmail.com> <200802261817.02830.david-b@pacbell.net> <4ac2955e0803030131t72354cecpbdaf53460ef3d09f@mail.gmail.com> In-Reply-To: <4ac2955e0803030131t72354cecpbdaf53460ef3d09f@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200803031107.36500.david-b@pacbell.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Monday 03 March 2008, mahendra varman wrote: > > > > Now as to *why* that happens, I don't know. We've certainly had folk > > using Philips/NXP EHCI controllers successfully before. Maybe this > > board has a hardware problem, like a bad chip or not having wired > > up the power lines that OHCI controller uses. > > still the low speed devices are giving unlink after no IRQ.. Not at all surprising if you haven't changed anything. You *did* verify this happens on all the ports of that chip? > My > hardware engineer says he followed the reference schematics of ISP1562 > of philips. He says that ohci side, the power lines are wired up > > My Ehci devices can be mounted and the files are read > Today I faced another issue > For some usb ehci devices its giving "device descriptor read/64, error > -71" ( for some usb stick of usb2.0) > but for others i can able to mount without this error..... > > Sir, Any clue regarding the above problem iam facing currently ?? I gave you all the clues I've got. You're the one with the uniquely mis-behaving hardware... Time for you to work harder at debugging your problem. You have the hardware, the software source code, a cooperative hardware engineer ... that's a lot more than most folk have when they start to chase down problems like this. - Dave