From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753564Ab0CUUns (ORCPT ); Sun, 21 Mar 2010 16:43:48 -0400 Received: from ksp.mff.cuni.cz ([195.113.26.206]:48808 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753522Ab0CUUnn (ORCPT ); Sun, 21 Mar 2010 16:43:43 -0400 Date: Sun, 21 Mar 2010 21:43:36 +0100 From: Pavel Machek To: Stanislav Brabec Cc: Andy Green , Eric Miao , dbaryshkov@gmail.com, Cyril Hrubis , arminlitzel@web.de, kernel list , Dirk@opfer-online.de, lenz@cs.wisc.edu, rpurdie@rpsys.net, linux-arm-kernel , thommycheck@gmail.com, zaurus-devel@www.linuxtogo.org, omegamoon@gmail.com Subject: Re: bit errors on spitz Message-ID: <20100321204335.GM1933@elf.ucw.cz> References: <20100305212708.GC21773@elf.ucw.cz> <20100308072858.GA29939@atrey.karlin.mff.cuni.cz> <20100308082530.GA1982@atrey.karlin.mff.cuni.cz> <4B98EF5D.5000609@warmcat.com> <1268322155.3990.114.camel@hammer.suse.cz> <4B995EE1.1050609@warmcat.com> <1268384824.4963.35.camel@utx.utx.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1268384824.4963.35.camel@utx.utx.cz> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri 2010-03-12 10:07:04, Stanislav Brabec wrote: > Andy Green wrote: > > On 03/11/10 15:42, Somebody in the thread at some point said: > > > Andy Green wrote: > > > > > >> I saw very similar failures for a long time on our iMX31 based device. > > >> Eventually I found a Freescale errata where the RAM inside the USB2 > > >> macrocell started to make single bit errors below 1.38V Vcore; ours was > > >> 1.4V at that time but dipped on CPU load. > > > > > > Good tip. It seems that nobody ported driver for the voltage control > > > chip ISL6271 from 2.4 kernel, and bootloader probably does not set > > > correct values. Are we sure about this one? If we have wrong voltages on various parts, that kind-off explains it. Would it be possible to measure (Voltmeter) difference between 2.4 kernel and 2.6 kernel? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html