This reference manual consists of the following: Using the Yocto Project: Provides an overview of the components that make up the Yocto Project followed by information about debugging images created in the Yocto Project. A Closer Look at the Yocto Project Development Environment: Provides a more detailed look at the Yocto Project development environment within the context of development. Technical Details: Describes fundamental Yocto Project components as well as an explanation behind how the Yocto Project uses shared state (sstate) cache to speed build time. Migrating to a Newer Yocto Project Release: Describes release-specific information that helps you move from one Yocto Project Release to another. Classes: Describes the classes used in the Yocto Project. Tasks: Describes the tasks defined by the OpenEmbedded build system. QA Error and Warning Messages: Lists and describes QA warning and error messages. Images: Describes the standard images that the Yocto Project supports. Features: Describes mechanisms for creating distribution, machine, and image features during the build process using the OpenEmbedded build system. Variables Glossary: Presents most variables used by the OpenEmbedded build system, which uses BitBake. Entries describe the function of the variable and how to apply them. Variable Context: Provides variable locality or context. FAQ: Provides answers for commonly asked questions in the Yocto Project development environment. Contributing to the Yocto Project: Provides guidance on how you can contribute back to the Yocto Project.