Small board with good Ethernet and GPS/PPS

[Hal Murray <hmurray%megapathdsl.net@localhost>]

I'm looking for something like a Raspberry Pi with a GPS HAT to run ntp.  The 
Raspberry Pi has its Ethernet connected via USB which adds a significant 
layer of jitter.  So I'm looking for something similar but with a good 
Ethernet connection.

[Yes, most people wouldn't notice the Ethernet jitter from USB.  I'm retired 
so I have time for things like this.]

The recent (ongoing?) discussion of a board with 2 LAN connections suggested 
Banana Pi and Orange Pi.  The good news is that they have the same 40 pin I/O 
connector as the Raspberry Pi so Pi HATs will probably work without a lot of 
effort.


I poked around via Google but didn't find anything that looked wonderful.  
For example, the Orange Pi claims to be open source but the schematics are 
hard to find.  It may be as simple as I'm not looking in the right place.


Does anybody have a favorite small board with both a good Ethernet connection 
and a way to connect GPS with PPS?



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