Getting OpenBSD running on Raspberry Pi 3

Ian Darwin writes in about his work deploying the arm64 platform and the Raspberry Pi 3:

So I have this empty white birdhouse-like thing in the yard, open at the front. It was intended to house the wireless remote temperature sensor from alow-cost weather station, which had previously been mounted on a dark-colored wall of the house (reading were really high when the sun reached that side of the house!).But when I put the sensor into the birdhouse, the signal is too weak for the weather station to receive it(the mounting post was put in place by a previous owner of our property, and is set deeply in concrete).So the next plan was to pop in a tiny OpenBSD computer with a uthum(4) temperature sensor and stream the temperature over WiFi.

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