This section takes a more detailed look inside the development process. The following diagram represents development at a high level. The remainder of this chapter expands on the fundamental input, output, process, and Metadata) blocks that make up development in the Yocto Project environment.
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In general, development consists of several functional areas:
User Configuration: Metadata you can use to control the build process.
Metadata Layers: Various layers that provide software, machine, and distro Metadata.
Source Files: Upstream releases, local projects, and SCMs.
Build System: Processes under the control of BitBake. This block expands on how BitBake fetches source, applies patches, completes compilation, analyzes output for package generation, creates and tests packages, generates images, and generates cross-development tools.
Package Feeds: Directories containing output packages (RPM, DEB or IPK), which are subsequently used in the construction of an image or SDK, produced by the build system. These feeds can also be copied and shared using a web server or other means to facilitate extending or updating existing images on devices at runtime if runtime package management is enabled.
Images: Images produced by the development process.
Application Development SDK: Cross-development tools that are produced along with an image or separately with BitBake.