BBB uarts & pps dts definitions

[Hal Murray]

tony at tndh.net said:
> I was not overly hopeful though because it was not clear to me how that
> would mesh with using NTPsec which would be expecting a DCD transition.

There is nothing magic about DCD as far as NTPsec is concerned.  What it 
needs is a file name that can be turned into a file handle to pass to 
time_pps_create()

I don't have PPS working on a BBB, but Linux works with PPS on GPIO on 
Raspberry Pi.


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