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6 Building a Yocto image
The Yocto Project is an open-source project that helps building Linux-based distributions, mainly for embe-
dedded products. Theobroma Systems provides a minimal BSP layer to allow building Yocto images for the
company's modules. An extended layer is also provided for a less bare experience, see instructions in Section
6.3 Extended meta layer. Upon request, access can be given to a more featureful "demonstration" layer which
provides hardware and software validation scripts as well as demo applications.
This user guide does not aim at getting the user familiar with development with the Yocto Project but rather
help them setup their build environment to create a basic Yocto image that can be used on one of Theobroma
Systems's modules.
The Yocto project provides an open source Linux build framework, which allows to create customized build
environments for embedded systems.
Yocto consists of the following parts:
• The Yocto Project tools,
• Reference Linux distribution (Poky),
• Build system (co-maintained with OpenEmbedded),
There exists extensive documentation for the Yocto Project and BitBake.
The Yocto Project releases a new version twice a year and some versions are maintained for a longer time when
marked as LTS (Long-Term Support). Such is the case of Kirkstone (4.0), supported until at least April 2024.
Theobroma Systems highly recommend to use LTS versions and update to a newer version once its support
has reached end-of-life, to benefit from bug fixes, security fixes, miscellaneous improvements and additional
features.
6.1 Prerequisites
While the Yocto Project supports mainy different build systems, Theobroma Systems currently only tests build-
ing on Debian 11 (Bullseye).
The required packages for Debian are listed in the documentation and can be installed with the following com-
mand:
sudo apt-get install -y --no-install-recommends gawk wget git diffstat unzip
texinfo gcc build-essential chrpath socat cpio python3 python3-pip python3-venv
python3-pexpect xz-utils debianutils iputils-ping python3-git python3-jinja2
libegl1-mesa libsdl1.2-dev xterm python3-subunit mesa-common-dev zstd
liblz4-tool file
6.2 BSP meta layer
The Yocto Project BSP meta layer can be found at https://git.theobroma-systems.com/yocto-layers/
meta-theobroma-systems-bsp.git/.
It contains the minimal configuration and recipe append files (bbappend) necessary to build a minimal working
image. It is meant to be a base upon which to build and thus many tools are purposefully missing.
v1.0.1
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