Date: Thu, 31 Jan 2013 22:39:51 -0800 From: Tim Kientzle <tim@kientzle.com> To: George Neville-Neil <gnn@neville-neil.com> Cc: freebsd-arm@freebsd.org, Ian Lepore <ian@freebsd.org> Subject: Re: SD card -image- for the beaglebone Message-ID: <A0BF05AA-4B61-4903-BDD9-D4F729FFA70A@kientzle.com> In-Reply-To: <D5C01DCF-E9B5-46CE-80E9-4EC5DBEC014B@neville-neil.com> References: <510A4F5B.7000407@g7iii.net> <1359646574.93359.327.camel@revolution.hippie.lan> <D5C01DCF-E9B5-46CE-80E9-4EC5DBEC014B@neville-neil.com>
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On Jan 31, 2013, at 7:58 AM, George Neville-Neil wrote: >=20 > On Jan 31, 2013, at 10:36 , Ian Lepore <ian@FreeBSD.org> 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
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