[time-nuts] Raspberry Pi 4 oscillator replacement

[Matthias Welwarsky]

On Donnerstag, 4. Februar 2021 11:20:23 CET Avamander wrote:
> Hi,
> 
> I was wondering if anyone here has replaced the 54 MHz oscillator on the
> Raspberry Pi 4 with a GNSS-disciplined rubidium standard? An overkill
> upgrade, but is technically doable? What hardware would it take in addition
> to a GNSS-disciplined rubidium standard and a Pi 4?
> 
> Here's where I got my inspiration from, someone replacing the oscillator on
> a Pi 3 with a TXCO:
> https://raspberrypi.stackexchange.com/questions/74482/switch-out-the-x1-osci
> llator-on-a-rpi-2-3

Feeding a 10MHz (suitably conditioned) clock signal directly from a Rb into a 
Beaglebone Black's external clock input (available on the extension header) 
and adding a small driver module to use a timer driven by this external clock 
as system clocksource is _way_ easier.

Just my €0.02

BR,
Matthias