Yocto Support for NVIDIA® Jetson™ with JetPack 7 Integration - Setting Up Yocto

Purpose of this tutorial

The goal of this wiki guide is to provide the instructions to configure, build, and install Yocto in NVIDIA platforms based in previous experience of the RidgeRun engineers. We hope this provides some light to new people using Yocto in Jetson. The tutorial uses the meta-tegra layer for Yocto. These instructions are based on the setup explained at Tegra Demo Distro.

If you run into any issues, please check the Yocto community tutorial as well.

Select your Machine

This version of JetPack introduces support for the Jetson AGX Thor development kit, and supports only AGX Thor targets. Machine configurations for the Orin family remain as an option on the meta-tegra code, but they are not usable and not supported. Taking this into consideration, the MACHINE variable that is used in yocto to describe the target platform can only be jetson-agx-thor-devkit

Install Yocto Dependencies

1. Use the following command to install Yocto dependencies on Ubuntu.

sudo apt-get install gawk wget git-core diffstat unzip texinfo gcc-multilib build-essential chrpath socat libsdl1.2-dev xterm zstd

2. Create a working directory for Yocto

YOCTO_DIR=/home/$USER/yocto-tegra
mkdir $YOCTO_DIR

3. Clone Tegra Demo Distro repository

git clone git@github.com:OE4T/tegra-demo-distro.git

4. Switch to the supported branch:

cd tegra-demo-distro
git checkout master-l4t-r38.2.x

5. Initialize git submodules:

git submodule update --init

Compile Yocto image

1. Source the setup-env script to create a build directory

. ./setup-env --machine jetson-agx-thor-devkit

2. Setup the required settings

local.conf

Open the file $YOCTO_DIR/build/conf/local.conf with your favorite text editor and append the following lines to the end of the file.
Setup the SSTATE and DOWNLOADS directories with a custom path to avoid re-downloading and re-compiling in the future.
Add the name of your target platform <MACHINE>.
Set IMAGE_CLASSES and IMAGE_FSTYPES to easily flash the target board.

MACHINE ?= "<MACHINE>"
IMAGE_CLASSES += "image_types_tegra"
SSTATE_DIR ?= "/home/${USER}/Yocto/sstate_dir"
DL_DIR ?= "/home/${USER}/Yocto/downloads"

Optional: By default, Yocto uses all the available cores and threads of the computer. If you want to limit the resources used on the build, you can add the following lines to your $YOCTO_DIR/build/conf/local.conf file. Change the parameters according to your needs and to your host machine specification.

BB_NUMBER_THREADS = '6'
PARALLEL_MAKE = '-j6'

bblayers.conf

Open the file $YOCTO_DIR/build/conf/bblayers.conf with your favorite text editor, here you can make sure that the meta-tegra layer is added to build/conf/bblayers.conf file to load the provided recipes. There are other useful layers automatically added by tegra demo distro setup script.

3. Build the image

Build a basic image that can be flashed into the Jetson AGX Thor with this command:

bitbake core-image-minimal

Or you can choose a different image from the following table

<IMAGE>	Description
core-image-minimal	minimally bootable image (no demo apps, no graphics)
demo-image-base	basic image with no graphics
demo-image-egl	basic image with DRM/EGL, no window manager
demo-image-sato	X11 image with 'sato' UI
demo-image-weston	Wayland with Weston compositor
demo-image-full	X11/sato UI plus docker, openCV, VPI, TensorRT and multimedia API samples

Index

Next: Flashing the Jetson Platform

❯