Book Image

Embedded Linux Development Using Yocto Project - Third Edition

By : Otavio Salvador, Daiane Angolini
Book Image

Embedded Linux Development Using Yocto Project - Third Edition

By: Otavio Salvador, Daiane Angolini

Overview of this book

The Yocto Project is the industry standard for developing dependable embedded Linux projects. It stands out from other frameworks by offering time-efficient development with enhanced reliability and robustness. With Embedded Linux Development Using Yocto Project, you’ll acquire an understanding of Yocto Project tools, helping you perform different Linux-based tasks. You’ll gain a deep understanding of Poky and BitBake, explore practical use cases for building a Linux subsystem project, employ Yocto Project tools available for embedded Linux, and uncover the secrets of SDK, recipe tool, and others. This new edition is aligned with the latest long-term support release of the aforementioned technologies and introduces two new chapters, covering optimal emulation in QEMU for faster product development and best practices. By the end of this book, you’ll be well-equipped to generate and run an image for real hardware boards. You’ll gain hands-on experience in building efficient Linux systems using the Yocto Project.
Table of Contents (20 chapters)

BitBake metadata collections

For BitBake, there is no metadata outside a metadata collection. Instead, a metadata collection has a unique name, and the common term the Yocto Project uses for those collections is Layer.

Chapter 1, Meeting the Yocto Project, explains that we have the following layers:

  • OpenEmbedded Core: This is inside the meta directory
  • Poky distribution: This is inside the meta-poky directory
  • Yocto Project reference BSP: This is inside the meta-yocto-bsp directory

The preceding list describes real examples of layers. Every layer contains a file called conf/layer.conf. This file defines several layer properties, such as the collection name and priority. The following figure shows the conf/layer.conf file for the meta-poky layer:

Figure 4.1 – The conf/layer.conf file for the meta-poky layer

Figure 4.1 – The conf/layer.conf file for the meta-poky layer

The preceding example is relatively simple but serves as a base for us to illustrate the conf/layer.conf file principles...