Anyone interested in adapting RasPi GPIO PPS driver for SG-2340/MBT-4220?
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There's a RasPi GPIO PPS driver for FreeBSD here:
https://github.com/BobBallance/freebsd-gpio-pps/wiki
The SG-2340/MBT-4220/MinnowBoard
( https://docs.netgate.com/platforms/minnowboard/faq.html )also has a GPIO interface, and a GPS module that goes on it:
https://minnowboard.org/add-ons/gps-lure
Would be nice to have a proper NTP server on the LAN while having pfSense in service...