Book Image

Yocto for Raspberry Pi

By : TEXIER Pierre-Jean, Petter Mabäcker
Book Image

Yocto for Raspberry Pi

By: TEXIER Pierre-Jean, Petter Mabäcker

Overview of this book

The Yocto Project is a Linux Foundation workgroup, which produces tools (SDK) and processes (configuration, compilation, installation) that will enable the creation of Linux distributions for embedded software, independent of the architecture of embedded software (Raspberry Pi, i.MX6, and so on). It is a powerful build system that allows you to master your personal or professional development. This book presents you with the configuration of the Yocto Framework for the Raspberry Pi, allowing you to create amazing and innovative projects using the Yocto/ OpenEmbedded eco-system. It starts with the basic introduction of Yocto's build system, and takes you through the setup and deployment steps for Yocto. It then helps you to develop an understanding of Bitbake (the task scheduler), and learn how to create a basic recipe through a GPIO application example. You can then explore the different types of Yocto recipe elements (LICENSE, FILES, SRC_URI, and so on). Next, you will learn how to customize existing recipes in Yocto/OE layers and add layers to your custom environment (qt5 for example).
Table of Contents (18 chapters)
Yocto for Raspberry Pi
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
3
Mastering Baking with Hob and Toaster

Understanding BitBake's tasks


The bitbake command is the primary interface to the BitBake tool. This chapter presents the bitbake command syntax and provides several execution examples.

For example, if you want to build a specific recipe, run the following command:

$ bitbake <recipe>

BitBake runs a set of scheduled tasks. When we wish to run a specific task, we can use the following command:

$ bitbake <recipe> -c <task>

If you want to clean a specific package (spitools , for example), you just have to run this:

$ bitbake spitools -c clean

To list the tasks defined for a recipe, we can use the following command:

$ bitbake <recipe> -c listtasks

Here is a description of BitBake tasks:

  • do_fetch: The first step when building a recipe is fetching the required source. This is done using the fetching backend feature we discussed previously. It is important to point out that fetching source or a file does not mean it is a remote source. In fact, every file required during the...