From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Thu, 04 May 2006 18:07:24 +0100 (BST) Received: from rtsoft2.corbina.net ([85.21.88.2]:1950 "HELO mail.dev.rtsoft.ru") by ftp.linux-mips.org with SMTP id S8133518AbWEDRHJ (ORCPT ); Thu, 4 May 2006 18:07:09 +0100 Received: (qmail 28823 invoked from network); 4 May 2006 21:12:09 -0000 Received: from wasted.dev.rtsoft.ru (HELO ?192.168.1.248?) (192.168.1.248) by mail.dev.rtsoft.ru with SMTP; 4 May 2006 21:12:09 -0000 Message-ID: <445A347A.5050507@ru.mvista.com> Date: Thu, 04 May 2006 21:06:02 +0400 From: Sergei Shtylyov Organization: MontaVista Software Inc. User-Agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.7.2) Gecko/20040803 X-Accept-Language: ru, en-us, en-gb MIME-Version: 1.0 To: Rodolfo Giometti CC: Linux-MIPS Subject: Re: Porting Au1x000 USB host controller on u-boot References: <20060504095341.GB19913@gundam.enneenne.com> In-Reply-To: <20060504095341.GB19913@gundam.enneenne.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 11315 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: sshtylyov@ru.mvista.com Precedence: bulk X-list: linux-mips Hello, Rodolfo Giometti wrote: > I'm trying to implement support for USB host into u-boot. I > initialized the USB controller just as linux does, the EDs and the TDs > look like good in memory but the controller seems not well reading > them and on the bus I see random USB messages... > > I think that there could be some problem on memory coherency... some > suggestion? Be sure to set Config0.OD (bit 19), it's proven to fix the USB-related lockups on Au1500 at least. See arch/mips/common/cputable.c for the CPU steppings where it must be set to mask various errata. Also, try to disable USB controller's DMA coherency in the USB enable register (there's a related errata in all Au1xx0 family) -- the Linux driver doesn't do this though, and this shouldn't matter unless you're modifying USB buffers on the fly. :-) Also, note that this magic bit may be write only, so make sure it's set on every write to CP0 Config0 reg. See this patch: http://www.linux-mips.org/archives/linux-mips/2006-03/msg00243.html > Thanks, > > Rodolfo WBR, Sergei