On Mon, 07 Dec 2020 15:55:32 +0000, Ahem A Rivet's Shot wrote:

> On Mon, 07 Dec 2020 14:50:01 +0000 Adam Funk 
> wrote:
>
>> I was just wondering about what kind of situation needs the external
>> clock so the time is accurate *before* NTP starts working.
>
>  It rather depends on how long might elapse before reaching a time
> server, if there's any danger of that being a long time then a RTC is
> very helpful, if you're sure of a time server immediately after boot
> then it's pretty much useless.

Don't forget that an old GPS unit, provided it has serial NMEA0183 output
which many of them had, can be used by ntpd as a primary time reference.
These can be connected to an RPI via a USB-serial adapter. There is a
reference driver for ntpd that allows it to accept an NMEA0183 primary
time stream.


--
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Martin    | martin at
Gregorie  | gregorie dot org

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