Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754459Ab0ATUN2 (ORCPT ); Wed, 20 Jan 2010 15:13:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754424Ab0ATUN1 (ORCPT ); Wed, 20 Jan 2010 15:13:27 -0500 Received: from iolanthe.rowland.org ([192.131.102.54]:37655 "HELO iolanthe.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1754395Ab0ATUNY (ORCPT ); Wed, 20 Jan 2010 15:13:24 -0500 Date: Wed, 20 Jan 2010 15:13:22 -0500 (EST) From: Alan Stern X-X-Sender: stern@iolanthe.rowland.org To: Lennart Sorensen cc: Kernel development list , , USB list , Subject: Re: Strange EHCI/OHCI IRQ and other PCI errors on boot with 2.6.32 (which 2.6.26 did not see) on Geode LX/CS5536. In-Reply-To: <20100120194201.GN24305@caffeine.csclub.uwaterloo.ca> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1374 Lines: 32 On Wed, 20 Jan 2010, Lennart Sorensen wrote: > On Wed, Jan 20, 2010 at 11:37:07AM -0500, Alan Stern wrote: > > It's true that the USB controllers appear to be the only devices using > > IRQ 5. But your startup log shows that only two of the three > > controllers have an associated driver. Maybe the third controller is > > generating the unwanted interrupts? > > Could be. But I never saw the problem with 2.6.26. That's puzzling me. > > Now I think the 3rd controller may be a client mode interface on the > Geode LX, which I certainly don't use if it has such a thing. > > I know what EHCI and OHCI mean. I don't know what UDC is. I see mention > of UDC under USB gadget support. I will try enabling that driver and > see what it does. "UDC" stands for "USB Device Controller". It is for use in device mode, as opposed to host mode (i.e., you could plug that controller into a regular PC and then use the Geode as a USB peripheral). It's possible that some change in the PCI setup is allowing that controller to generate interrupts whereas before it didn't. Or this could be a total red herring. Alan Stern -- 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/