Book Image

Embedded Linux Development with Yocto Project

By : Otavio Salvador
Book Image

Embedded Linux Development with Yocto Project

By: Otavio Salvador

Overview of this book

A practical tutorial guide which introduces you to the basics of Yocto Project, and also helps you with its real hardware use to boost your Embedded Linux-based project. If you are an embedded systems enthusiast and willing to learn about compelling features offered by the Yocto Project, then this book is for you. With prior experience in the embedded Linux domain, you can make the most of this book to efficiently create custom Linux-based systems.
Table of Contents (17 chapters)
15
A. References
16
Index

Changing recipe feature configuration

One supported mechanism to ease feature-set customization for recipes is PACKAGECONFIG. It provides a way to enable and disable the recipe features. For example, if the recipe has the following configuration:

PACKAGECONFIG ?= "feature1" 
PACKAGECONFIG[feature1] = "--enable-feature1,--disable-  feature1,feature1depends" 
PACKAGECONFIG[feature2] = "--enable-feature2,--disable-  feature2,feature2depends" 

The recipe has two features, feature1 and feature2. For each configuration option, there is a string to define how to enable the feature on autoconf, how to disable the feature on autoconf, and the new dependencies in case the option is enabled.

We can create a .bbappend file that expands the PACKAGECONFIG variable's default value to enable feature2 as well, as shown:

PACKAGECONFIG += "feature2" 

Tip

In order to add the same feature in the build/conf/local.conf file, we can use PACKAGECONFIG_pn-<recipename&gt...