From owner-freebsd-arm@FreeBSD.ORG Fri Feb 1 06:39:54 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 8ED354AB; Fri, 1 Feb 2013 06:39:54 +0000 (UTC) (envelope-from tim@kientzle.com) Received: from monday.kientzle.com (99-115-135-74.uvs.sntcca.sbcglobal.net [99.115.135.74]) by mx1.freebsd.org (Postfix) with ESMTP id 4580FDCC; Fri, 1 Feb 2013 06:39:53 +0000 (UTC) Received: (from root@localhost) by monday.kientzle.com (8.14.4/8.14.4) id r116drk7059267; Fri, 1 Feb 2013 06:39:53 GMT (envelope-from tim@kientzle.com) Received: from [192.168.2.143] (CiscoE3000 [192.168.1.65]) by kientzle.com with SMTP id h55yfxai8wb6rhyngzbv63pbn6; Fri, 01 Feb 2013 06:39:53 +0000 (UTC) (envelope-from tim@kientzle.com) Subject: Re: SD card -image- for the beaglebone Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=windows-1252 From: Tim Kientzle In-Reply-To: Date: Thu, 31 Jan 2013 22:39:51 -0800 Content-Transfer-Encoding: quoted-printable Message-Id: References: <510A4F5B.7000407@g7iii.net> <1359646574.93359.327.camel@revolution.hippie.lan> To: George Neville-Neil X-Mailer: Apple Mail (2.1283) Cc: freebsd-arm@freebsd.org, Ian Lepore X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list 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 06:39:54 -0000 On Jan 31, 2013, at 7:58 AM, George Neville-Neil wrote: >=20 > On Jan 31, 2013, at 10:36 , Ian Lepore wrote: >=20 >> On Thu, 2013-01-31 at 11:02 +0000, Iain Young wrote: >>> Hi Folks, >>>=20 >>> I have just taken delivery of a few Beaglebones that I am intending = to >>> do some NTP Work. With FreeBSD having one of the better reputations >>> with regards to Time and PPS etc, I thought I would install FreeBSD = on >>> at least one of them. >>>=20 >>> Does anyone have an *image* of a base install for a 4 Gig microSD >>> card that I can download ? Preferably with ssh and dhcp installed >>> (yes, I know about blowing away the keys), as that would avoid = having >>> to rely on the console. I plan to build and release a dev snapshot image in a few days, as soon as I finish up my current round of network driver fixes. >> 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. >>=20 >=20 > Ah, but PTPd would be very happy with nanosecond accuracy. The = biggest > problem I see in PTPd on something like a BeagleBone is the network > interface. We need to get that cleaned up and then see how much = jitter it has. I presume you've noticed the reference in the AM335x TRM: 14.3.7 Common Platform Time Sync Module "The CPTS module is used to facilitate host control of time sync operations. It enables compliance with the IEEE 1588-2008(v2) standard for a precision clock synchronization protocol." Looks like it wouldn't be too hard to add to the CPSW network driver. Are there any examples of this being supported by other network drivers? I've also been eyeing the GPS module from Adafruit. Hmmm=85. Tim