Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760016AbYCZLMS (ORCPT ); Wed, 26 Mar 2008 07:12:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754432AbYCZLMJ (ORCPT ); Wed, 26 Mar 2008 07:12:09 -0400 Received: from jurassic.park.msu.ru ([195.208.223.243]:34707 "EHLO jurassic.park.msu.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754179AbYCZLMI (ORCPT ); Wed, 26 Mar 2008 07:12:08 -0400 Date: Wed, 26 Mar 2008 14:12:04 +0300 From: Ivan Kokshaysky To: Ingo Molnar Cc: Thomas Meyer , Stefan Richter , Linus Torvalds , Thomas Gleixner , "Rafael J. Wysocki" , LKML , Adrian Bunk , Andrew Morton , Natalie Protasevich Subject: Re: ohci1394 problem (MMIO broken) (was 2.6.25-rc6-git6: Reported regressions from 2.6.24) Message-ID: <20080326111204.GB9060@jurassic.park.msu.ru> References: <47E557D5.9020604@s5r6.in-berlin.de> <47E807EE.2030902@m3y3r.de> <47E8217C.9080400@s5r6.in-berlin.de> <20080325073117.GA8469@elte.hu> <20080325165007.GA7775@elte.hu> <47E94557.4030001@m3y3r.de> <20080325201125.GD15330@elte.hu> <20080325202954.GA22007@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080325202954.GA22007@elte.hu> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 991 Lines: 22 On Tue, Mar 25, 2008 at 09:29:54PM +0100, Ingo Molnar wrote: > OTOH, before this system worked for you before, i start to suspect that > ioremap is a red herring here and that it's the code that gets to that > physical address (which is ioremap-ed) is at fault here. > > the hard hang might be your southbridge totally dumbfounded by the host > OS attempting to do an MMIO access to an above-4GB address? The Intel 94x chipsets must be OK wrt >4Gb MMIO accesses, as far as I know. You should just get all 1s on read of non-existent MMIO address, as usual. Not a hard hang. So I suspect something is still broken in 64-bit ioremap... It would be nice to sort that out, even though it seems to be unrelated to this particular problem. Ivan. -- 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/