Book Image

Embedded Linux Development Using Yocto Project Cookbook - Second Edition

By : Alex Gonzalez
Book Image

Embedded Linux Development Using Yocto Project Cookbook - Second Edition

By: Alex Gonzalez

Overview of this book

The Yocto Project has become the de facto distribution build framework for reliable and robust embedded systems with a reduced time to market.You'll get started by working on a build system where you set up Yocto, create a build directory, and learn how to debug it. Then, you'll explore everything about the BSP layer, from creating a custom layer to debugging device tree issues. In addition to this, you’ll learn how to add a new software layer, packages, data, scripts, and configuration files to your system. You will then cover topics based on application development, such as using the Software Development Kit and how to use the Yocto project in various development environments. Toward the end, you will learn how to debug, trace, and profile a running system. This second edition has been updated to include new content based on the latest Yocto release.
Table of Contents (13 chapters)
Title Page
Packt Upsell

Creating a custom BSP layer

The changes needed to support a new hardware platform, or machine, are kept on a separate Yocto layer, called a BSP layer. This separation is best for future updates and patches to the system. A BSP layer can support any number of new machines and any new software feature that is linked to the hardware itself.

How to do it...

By convention, Yocto layer names start with meta, short for metadata. A BSP layer may then add a bsp keyword, and finally a unique name. We will call our layer meta-bsp-custom.

There are several ways to create a new layer:

  • Manually, once you know what is required
  • By copying the meta-skeleton layer included in Poky
  • By using the yocto-layer command-line tool

You can have a look at the meta-skeleton layer in Poky and see that it includes the following elements:

  • A layer.conf file, where the layer configuration variables are set
  • A COPYING.MIT license file
  • Several directories named with the recipes- prefix with example recipes for BusyBox, the Linux kernel...