View source for Setting up Yocto for Jetpack 4.4

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== Select your Machine ==
You can apply the instructions in this wiki for multiple devices, so, whenever you see <MACHINE>, replace it (with the <> symbols included) with your target platform. Below you will find the possible <MACHINE> substitutions.
<br>
<br>
{| class="wikitable" style="margin: auto;"
!colspan="1"|Device
!colspan="3"|<MACHINE>
|-
|TX1
|jetson-tx1 
| 
| 
|-
|TX2
|jetson-tx2 
|jetson-tx2i'''*'''
|jetson-tx2-4gb'''*'''
|-
|XAVIER
|jetson-xavier 
|jetson-xavier-8gb'''*'''
|
|-
|NANO
|jetson-nano-qspi-sd
|jetson-nano-emmc'''*'''
|
|-
|XAVIER NX
|jetson-xavier-nx-devkit'''*'''
|jetson-xavier-nx-devkit-emmc'''*'''
|
|- 
!colspan="5"|Note: the machines with * have NOT been tested by RidgeRun yet
|}

== Install Dependencies ==

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

<source lang="bash">
sudo apt-get install gawk wget git-core diffstat unzip texinfo gcc-multilib build-essential chrpath socat libsdl1.2-dev xterm
</source>

2. Create a working directory for Yocto

<source lang="bash">
YOCTO_DIR=/home/$USER/yocto-tegra
mkdir $YOCTO_DIR
</source>

3. Select the latest branch (as per May 2020)

<source lang="bash">
export BRANCH="dunfell" 
</source>

4. Download Yocto's Poky base meta-layer

<source lang="bash">
cd $YOCTO_DIR
git clone -b ${BRANCH} git://git.yoctoproject.org/poky.git poky-${BRANCH}
</source>

5. Download meta-tegra

<source lang="bash">
git clone -b ${BRANCH}-l4t-r32.4.3 https://github.com/madisongh/meta-tegra.git
</source>

== Compile Yocto image ==
1. Initialize the build environment

<source lang="bash">
cd $YOCTO_DIR
source poky-${BRANCH}/oe-init-build-env build
</source>

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.
* Set 3.6 as the ''python3'' and ''python3-native'' preferred version.

{{Ambox
|type=notice
|small=left
|issue='''The python recipes are NOT included in the main meta-tegra repository yet.'''
|style=width:unset;
}}

{{Ambox
|type=notice
|small=left
|issue='''Note:''' Replace <MACHINE> with your selected machine (don't delete the quotes "")
|style=width:unset;
}}

<source lang="bash">
MACHINE ?= "<MACHINE>"

IMAGE_CLASSES += "image_types_tegra"
IMAGE_FSTYPES = "tegraflash"

SSTATE_DIR ?= "/home/${USER}/Yocto/sstate_dir"
DL_DIR ?= "/home/${USER}/Yocto/downloads"

PREFERRED_VERSION_python3 = "3.6%"
PREFERRED_VERSION_python3-native = "3.6%"
</source>

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.

<source lang=bash>
BB_NUMBER_THREADS = '6'
PARALLEL_MAKE = '-j6'
</source>

'''bblayers.conf'''

Open the file ''$YOCTO_DIR/build/conf/bblayers.conf'' with your favorite text editor and add the meta-tegra layer to the ''build/conf/bblayers.conf'' file to load the provided recipes:

<source lang="bash">
 BBLAYERS ?= " \         
  /home/${USER}/yocto-tegra/meta-tegra \                                                                                                                                                                                                                                                                                                                                                                
  /home/${USER}/yocto-tegra/poky-dunfell/meta \       
  /home/${USER}/yocto-tegra/poky-dunfell/meta-poky \                                                                                                                                                                
  /home/${USER}/yocto-tegra/poky-dunfell/meta-yocto-bsp \                                                                                                                                                                                                                                                                                                    
  "
</source>

3. Build the image

Use an image with developer tools such as GStreamer, NVIDIA plugins, etc
<source lang="bash">
bitbake core-image-sato-dev
</source>

Or you can choose a different image from the following table

{| class="wikitable" style="margin: auto;"
!colspan="3"|<IMAGE>
|-
|core-image-sato-dev
|-
|core-image-weston
|-
|core-image-base
|}

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[[Category:Yocto Support for NVIDIA Jetson Platforms]]