OpenBSD/arm64 is a port of OpenBSD to various 64-bit ARM based systems.
A mailing list for ARM-based ports is available at
arm@openbsd.org.
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The current target platforms are the Pine64 and the Raspberry Pi 3.
OpenBSD/arm64 bundles various platforms sharing the 64-bit ARM architecture. Due to the fact that there are many System on a Chips (SoC) around, OpenBSD/arm64 differentiates between various SoCs and may have a different level of support between them.
Snapshots are made available from time to time, in this location as well as in a few mirrors. Here are the OpenBSD/arm64 snapshot installation instructions as well.