[time-nuts] Re: Ryzen mobos with serial port for Garmin GPS?

[Thomas Valerio]

Personally I think you would be better off with a Raspberry PI solution on
your local gigabit net, however a simple google search for "gigabyte am4
rs232" resulted in the link below.  The first two boards in the comparison
table both have serial ports.  I have had good experiences with Gigabyte
motherboards, also there was a used GA-AB350-GAMING 3 listed on eBay for
under $70 although the seller didn't have the greatest feedback score.

   Thomas Valerio


     https://www.gigabyte.com/us/Comparison/Result/2?pids=6166,6167,6225,6227



> Looking to design my next Linux (Ubuntu) system, built around a Ryzen
> processor.
>
> In previous systems, I've had great success using a Garmin GPS 18x unit
> (small hockey puck with a wire tail) hooked up to a DB9 serial (COM)
> port on the motherboard, to provide a local (stratum-0) time reference
> via gpsd and chronyd.  However, mobos with a serial port are becoming
> harder to find.
>
> (Yes, I know that PCI serial port cards exist -- however, these are not
> suitable for connecting a GPS time reference because the PPS signal
> timing is unpredictable -- so I've limited myself to using motherboards
> with a builtin serial port.)
>
> What Ryzen (Socket AM4) motherboards have worked out well for people who
> want to do what I'm proposing?
>
> Alternatively, can anyone recommend a better hardware solution than a
> Garmin GPS attached via a serial port?
>
> Thanks for any suggestions.
>
> *Rich Wales*
> richw at richw.org
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