Introduction: Building target AGL image with Yocto project

The standard Yocto process is made of the following steps:

  • Setting up your operating system.
  • Setting up the build environment for R-Car BSP.
  • Downloading the proprietary drivers and installing them in the build environment (if needed).
  • Build the image.
  • Boot using SD-CARD.
    • Create an SD-CARD.
    • Configure to boot on SD-CARD.
    • Copy the image to the SD-CARD.
    • Boot the board on it.

For convenience, the resulting development images are made available Here

If you want to bypass the build phase and quick boot the board, you can download the image tarball and the kernel then follow the installation procedure.

Setting up your operating system

The very first step is to ensure that your system can run the build system of the Yocto Project.

Important: it only runs on Linux

  • if your system is Windows© or iOS© you should use a virtualization solution (Virtualbox, VMWare …) to run a Linux VM on your system.

For AGL 2.1, Yocto Project 2.1, known as krogoth, has been selected for the BSP and build system.

Reference data for configuring your system can be found in the Yocto documentation Here

Here after an extract of this documentation for most common Linux distributions:

  • The build system should be able to run on any modern distributions that has the following versions for:
    • Python
    • Git 1.7.8 or greater
    • tar 1.24 or greater
    • GCC, …

Note:

  • Python 2.7.3 or greater excluding Python 3.x, which is not supported.

Ubuntu and Debian

The essential and graphical support packages you need for a supported Ubuntu or Debian distribution are shown in the following command:

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

Note:

  • Also note that for this tutorial, the utility ‘curl’ has been added to the list of packages to install.

Fedora

The essential and graphical packages you need for a supported Fedora distribution are shown in the following command:

sudo yum install gawk make wget tar bzip2 gzip python unzip perl patch \
     diffutils diffstat git cpp gcc gcc-c++ glibc-devel texinfo chrpath \
     ccache perl-Data-Dumper perl-Text-ParseWords perl-Thread-Queue socat \
     SDL-devel xterm curl

OpenSUSE

The essential and graphical packages you need for a supported OpenSUSE distribution are shown in the following command:

sudo zypper install python gcc gcc-c++ git chrpath make wget python-xml \
     diffstat texinfo python-curses patch socat libSDL-devel xterm curl \
     python3 python3-curses glibc-locale

CentOS

The essential and graphical packages you need for a supported CentOS distribution are shown in the following command:

sudo yum install gawk make wget tar bzip2 gzip python unzip perl patch \
     diffutils diffstat git cpp gcc gcc-c++ glibc-devel texinfo chrpath \
     socat SDL-devel xterm curl

Download AGL Source Code

The AGL source code and Yocto layers are maintained on the AGL Gerrit server.
For information on how to create accounts for gerrit see Getting Started with AGL.

Setting up the build environment

In the following, your top level directory is noted as “AGL_TOP”.
For example, we will set AGL_TOP to point to a directory “$HOME/workspace_agl”:

export AGL_TOP=$HOME/workspace_agl
mkdir -p $AGL_TOP

Prepare Repo Tool

AGL Uses the ‘repo’ tool for managing repositories.
You need to setup layers of AGL.
You can use the commands below to prepare Repo:

mkdir -p ~/bin
export PATH=~/bin:$PATH
curl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
chmod a+x ~/bin/repo

Note:

  • More information about the tool ‘repo’ Here

Download source

You can choose your source release

Download Latest Stable Release

To download all layers for the for the latest stable release, dab 4.0.2:

cd $AGL_TOP
repo init -b dab -m dab_4.0.2.xml -u https://gerrit.automotivelinux.org/gerrit/AGL/AGL-repo
repo sync

Download Latest on dab Branch

To download all layers on the current release branch which may be in the midst of testing or changes prior to the next stable release:

cd $AGL_TOP
repo init -b dab -u https://gerrit.automotivelinux.org/gerrit/AGL/AGL-repo
repo sync

Download Master Branch

To download all code from master:

cd $AGL_TOP
repo init -u https://gerrit.automotivelinux.org/gerrit/AGL/AGL-repo
repo sync

Set up Build Environment Info

AGL has created a set up script for defining the target build and desired optional features.
To get a complete list of the options available run.

cd $AGL_TOP
source meta-agl/scripts/aglsetup.sh -h

Once you run aglsetup.sh with your desired parameters, you can build any target desired.

Features supported by aglsetup

Here is the list of features for AGL 2.1 that can be specified in the aglsetup.sh command line:

  • in meta-agl
    • agl-archiver:
    • agl-devel: activate development options (empty root password, debugger, strace, valgrind …)
    • agl-isafw:
    • agl-netboot: enable network boot support through TFTP and NBD (see meta-netboot layer)
  • in meta-agl-devel
    • agl-oem-extra-libs:
    • agl-renesas-kernel:
  • in meta-agl-extra
    • agl-appfw-smack: enables IoT.bzh Application Framework + SMACK + Cynara
    • agl-demo: enable layer meta-agl-demo and meta-qt5 - required to build * agl-demo-platform
    • agl-localdev: add a local layer named “meta-localdev” in meta directory and a local.dev.inc conf file if present
    • agl-sota: enable SOTA components and dependencies (meta-sota, meta-filesystems, meta-ruby, meta-rust are added)

For newer features or to get more details on a given feature, take a look at the configuration files stored for each feature and/or each machine in meta-agl/templates and meta-agl-extra/templates.