From owner-freebsd-arm@FreeBSD.ORG Fri Feb 1 19:06:18 2013 Return-Path: Delivered-To: freebsd-arm@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id EE49737C; Fri, 1 Feb 2013 19:06:18 +0000 (UTC) (envelope-from ticso@cicely7.cicely.de) Received: from raven.bwct.de (raven.bwct.de [85.159.14.73]) by mx1.freebsd.org (Postfix) with ESMTP id 81E769CD; Fri, 1 Feb 2013 19:06:18 +0000 (UTC) Received: from mail.cicely.de ([10.1.1.37]) by raven.bwct.de (8.13.4/8.13.4) with ESMTP id r11J5uOg045076 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 1 Feb 2013 20:05:57 +0100 (CET) (envelope-from ticso@cicely7.cicely.de) Received: from cicely7.cicely.de (cicely7.cicely.de [10.1.1.9]) by mail.cicely.de (8.14.5/8.14.4) with ESMTP id r11J4ZdA078698 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 1 Feb 2013 20:04:36 +0100 (CET) (envelope-from ticso@cicely7.cicely.de) Received: from cicely7.cicely.de (localhost [127.0.0.1]) by cicely7.cicely.de (8.14.2/8.14.2) with ESMTP id r11J4ZG4080494; Fri, 1 Feb 2013 20:04:35 +0100 (CET) (envelope-from ticso@cicely7.cicely.de) Received: (from ticso@localhost) by cicely7.cicely.de (8.14.2/8.14.2/Submit) id r11J4Zmi080493; Fri, 1 Feb 2013 20:04:35 +0100 (CET) (envelope-from ticso) Date: Fri, 1 Feb 2013 20:04:35 +0100 From: Bernd Walter To: Ian Lepore Subject: Re: SD card -image- for the beaglebone Message-ID: <20130201190434.GK67562@cicely7.cicely.de> References: <510A4F5B.7000407@g7iii.net> <1359646574.93359.327.camel@revolution.hippie.lan> <510AE1D6.8010203@g7iii.net> <1359668656.93359.339.camel@revolution.hippie.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1359668656.93359.339.camel@revolution.hippie.lan> X-Operating-System: FreeBSD cicely7.cicely.de 7.0-STABLE i386 User-Agent: Mutt/1.5.11 X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED=-1, BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01 autolearn=unavailable version=3.3.0 X-Spam-Checker-Version: SpamAssassin 3.3.0 (2010-01-18) on spamd.cicely.de Cc: freebsd-arm@freebsd.org X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list Reply-To: ticso@cicely.de List-Id: Porting FreeBSD to the StrongARM Processor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Feb 2013 19:06:19 -0000 On Thu, Jan 31, 2013 at 02:44:16PM -0700, Ian Lepore wrote: > On Thu, 2013-01-31 at 21:27 +0000, Iain Young wrote: > > On 31/01/13 15:36, Ian Lepore wrote: > > > > > So you're interested in a PPS driver for BeagleBone? That would be fun > > > to play with, I wonder what the BB's timer hardware looks like? It'd be > > > easy enough to do with a gpio interrupt I suspect, but the timing geek > > > in me can't resist going for the nanosecond-accurate measurements when > > > possible, even if it is kind of pointless for millisecond-accurate NTP. > > > > Yep. Planning on hooking up MSF, DCF, and TDF clocks to GPIO pins, as > > well as some GPS units. Originally planned for doing this with some > > Pi, but found the bone had serial ports and things developed from there > > > > Planning on abusing UART3's CTS pin for initial basic testing, as > > radioclkd and radioclkd2 have only support for serial ports, but > > then it will be working out what if anything I need to patch into the > > kernel to get the PPS subsystem to listen to particular GPIO pins. > > > > Also planning to test PHK's ntpns, which has DCF support, > > and should be easy to modify for MSF. Anyway, this is heading far > > too quickly to being on-topic for time-nuts but off-topic here > > You might be surprised how many time nuts read this list, several of us > do it for a living. Absolutely - there is a reason why I have a rubidium here. Thought of using it with a zedboard - it's FPGA and gbit/s ethernet sounds as a good combination. The most important thing however is a red LED based 7-Segment microsecond display (without multiplexing) - not that anyone can read. I even thought of doing ntp protocol in FPGA logic. Unfortunately the GPS receiver I bought has no PPS output :-( Getting an accurate time is more difficult then keeping it. And leap seconds won't make it easier. What are MSF and TDF? I'm aware of GPS, DCF77 and LORAN-C to be available in Germany. -- B.Walter http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.