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.

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Description

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

Enabling:

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

Prerequisites

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

Building

1. execute ./prepare.sh from repository root