Sorry, yeah I mean Pi-like SBC, ie with GPIO. In my case a NanoPi NEO-LTS[1], mainly because I had one available and I didn't need much hardware just to run the NTP (it's all it does).

It runs Armbian[2] and has been sitting there doing its thing for a few years now.

All you need is a GPIO for PPS, but it's nice to have the UART so it can parse the time and such.

edit: since it's slightly different on Armbian from a Raspberry Pi, you need to enable the pps-gpio overlay similarly[3], but the pin parameter is different[4], for the H3 in the NanoPi NEO for example see here[5].

[1]: https://www.friendlyelec.com/index.php?route=product/product...

[2]: https://www.armbian.com/nanopi-neo/

[3]: https://forum.armbian.com/topic/9901-pps-gpio-no-longer-defa...

[4]: https://docs.armbian.com/User-Guide_Armbian_overlays/#overla...

[5]: https://github.com/armbian/sunxi-DT-overlays/blob/d925cfbb0c...