From owner-freebsd-arm@FreeBSD.ORG Sat Dec 9 17:58:04 2006 Return-Path: X-Original-To: freebsd-arm@freebsd.org Delivered-To: freebsd-arm@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 5417F16A4FB for ; Sat, 9 Dec 2006 17:58:04 +0000 (UTC) (envelope-from imp@bsdimp.com) Received: from harmony.bsdimp.com (vc4-2-0-87.dsl.netrack.net [199.45.160.85]) by mx1.FreeBSD.org (Postfix) with ESMTP id BD3BF43CA0 for ; Sat, 9 Dec 2006 17:56:55 +0000 (GMT) (envelope-from imp@bsdimp.com) Received: from localhost (localhost [127.0.0.1]) by harmony.bsdimp.com (8.13.4/8.13.4) with ESMTP id kB9HtcFw059342; Sat, 9 Dec 2006 10:55:38 -0700 (MST) (envelope-from imp@bsdimp.com) Date: Sat, 09 Dec 2006 10:56:34 -0700 (MST) Message-Id: <20061209.105634.1690385738.imp@bsdimp.com> To: ticso@cicely.de, ticso@cicely12.cicely.de From: "M. Warner Losh" In-Reply-To: <20061209114124.GB54209@cicely12.cicely.de> References: <20061208114906.GJ54209@cicely12.cicely.de> <20061208.223200.-1303464500.imp@bsdimp.com> <20061209114124.GB54209@cicely12.cicely.de> X-Mailer: Mew version 4.2 on Emacs 21.3 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.0 (harmony.bsdimp.com [127.0.0.1]); Sat, 09 Dec 2006 10:55:38 -0700 (MST) Cc: freebsd-arm@freebsd.org Subject: Re: questions about current RM9200 state X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to the StrongARM Processor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 09 Dec 2006 17:58:04 -0000 In message: <20061209114124.GB54209@cicely12.cicely.de> Bernd Walter writes: : On Fri, Dec 08, 2006 at 10:32:00PM -0700, M. Warner Losh wrote: : > In message: <20061208114906.GJ54209@cicely12.cicely.de> : > Bernd Walter writes: : > : On Fri, Dec 08, 2006 at 11:42:28AM +0100, Bernd Walter wrote: : > : > On Thu, Dec 07, 2006 at 08:50:08PM -0700, M. Warner Losh wrote: : > : > > In message: <20061208015032.GF54209@cicely12.cicely.de> : > : > > Bernd Walter writes: : > : > > : But I can't probe the bus from userland: : > : > > : [56]arm9# ./iic_probe /dev/iic0 : > : > > : - and nothing listed. : > : > > : > : > > twi doesn't support START/STOP ioctls that you use. Hmmm, that's in : > : > > p4 that I've removed them because I never got that working. I also : > : > > think the version in -head isn't the latest, working one. I think you : > : > > do the same thing with a 0 byte transfer. Except we don't detect : > : > > NOACK quite right yet, I'm afraid. I'd expect an error each time you : > : > > tried. : > : > : > : > Ah - Ok, will switch to 0 Byte transfers and retest. : > : : > : iic.c: : > : case I2CWRITE: : > : if (s->count <= 0) { : > : error = EINVAL; : > : break; : > : } : > : : > : Well - it wouldn't work without NOACK detection anyway. : > : > I think a zero-byte transfer would do it. : : Unfortunately the TWI controller can't do zero transfers at all :( : I thought the RM9200 has different one, but it is the same ^$%@ as in : the AT91SAM7 series, which I already had some hard time with. : The TWI controller in the AVR series is much better IMHO. : I'll send you a diff later today to fix some small bugs that I've found : in the driver - those points aren't documented very well in the : handbook. BTW, I have a AVR32 eval board... Warner