REFCLOCK rises again

[Hal Murray]

> There is one interesting area that it doesn't cover.  The kernel (on most
> OSes) has an optional PLL that locks on to a PPS source.  ntpd acts as a
> sanity check and turns that on and off.  If we want to use that mode, we need
>  a back channel, or an ugly wart in ntpd.  We can probably get the back
> channel via ntpq. 

LOCKCLOCK gets tangled up with this.  I don't have the details worked out, but 
it feels like it should work.


-- 
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