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

Constructing the build directory


The Yocto Project's tool inputs and outputs were already detailed in a high abstract level in the previous chapters. We already know that BitBake uses metadata to generate a set of artifacts, including images. Besides the generated artifacts, BitBake creates much more content during the process, which may be used in several ways, dependent upon our goals.

During the build process, BitBake performs several tasks and modifies the build directory. We can understand it better following the usual BitBake flow, as follows:

  • Fetching: The first action realized by BitBake is to download the source code. This step modifies the build directory, including a new tarball inside the build/download directory.

  • Source preparation: After the fetching of the source code is complete, it must be prepared for use. This may involve, for example, the unpacking of a tarball or a clone of a local cached Git directory (from the download cache). The source code is prepared in the build...