Date: Thu, 31 Jan 2013 14:44:16 -0700 From: Ian Lepore <ian@FreeBSD.org> To: Iain Young <iain@g7iii.net> Cc: freebsd-arm@FreeBSD.org Subject: Re: SD card -image- for the beaglebone Message-ID: <1359668656.93359.339.camel@revolution.hippie.lan> In-Reply-To: <510AE1D6.8010203@g7iii.net> References: <510A4F5B.7000407@g7iii.net> <1359646574.93359.327.camel@revolution.hippie.lan> <510AE1D6.8010203@g7iii.net>
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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. -- Ian
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