There is another project out there using a BeagleBone Black plus a small hardware RTC and a GPS module hooked up over GPIO/serial. The advantage there is that the BBB supports hardware PTP timestamping on its built-in NIC. I threw one together over a weekend, just need to design up a small box to hold it all in (though the cable mess of jumpers also made me want to design an interposer board to clean things up)
There is another project out there using a BeagleBone Black plus a small hardware RTC and a GPS module hooked up over GPIO/serial. The advantage there is that the BBB supports hardware PTP timestamping on its built-in NIC. I threw one together over a weekend, just need to design up a small box to hold it all in (though the cable mess of jumpers also made me want to design an interposer board to clean things up)