Suppose I had something like a Rubidium oscillator that makes
a nice PPS signal, but it's not synchronized to a second boundary.

Is there any way to take advantage of that?

I'm thinking of something like the temperature compensation tricks.
Use the PPS signal from the Rubidium osc to calibrate the system
clock and either pass the correction to the kernal via a back door
or pass it to NTP via a side door where NTP would add it to the
correction NTP already passes to the kernel.

Has anybody done anything like this?

Of course, another approach would be to use the Rubidium osc
to drive the system clocks.  That's simpler software at the
cost of more complicated hardware. I haven't seen many writeups
on how to do that.  Have I missed them? 

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