A64 additions to OpenBSD u-boot port

Please, do not use kernel with these patches on a board without proper cooling!

I'm not responsible for any damage.

Please, review the code before use.

Description

This repository contains A64 additions from FreeBSD overlays that seem to work nicely with OpenBSD u-boot port.

Enabling:

getting/setting CPU speed
getting/setting CPU voltage
reading e-fuses values (required by temp. sensor)
calibrated CPU/GPU temperature readings
enabling PWM
enabling battery state readings
enabling thermal zones support

Prerequisites

make sure /usr/ports are updated
make sure /usr/ports/sysutils/u-boot can be built for FLAVOR=aarch64

Building

execute ./prepare.sh from repository root