Introduction

This wiki is intended to be used as a reference If you want to create a Device Tree (DT) overlay for a custom hardware module. DT overlay is used to configure various hardware devices that may be attached to the system.

Nvidia Jetson kernels use a Device Tree (DT) to describe the hardware present in the Nvidia Jetson board. You can use Jetson‑IO to support a custom hardware module by creating a device tree overlay for the hardware module to allow optional external hardware to be described and configured.

Create a device tree overlay

Jetson‑IO

NVIDIA provides the Jetson Expansion Header Tool (also known as Jetson‑IO), a Python script that runs on a Jetson developer kit and lets you apply a DT overlay configuration through a graphic user interface. Jetson‑IO finds the overlay file and allows you to apply it.

Device tree overlay

Support for hardware modules is handled by device tree overlay files (.dtbo files).