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Course Outline
- Getting Started
- Acquiring Buildroot
- Build system prerequisites
- Cross-compiler terminology: build, host, target, and sysroot
- Selecting the appropriate target
- Constructing a minimal embedded system and booting it
- Exploring the contents of the resulting filesystem image
- Utilizing parallel builds
- Executing full and partial rebuilds
- Design objectives of Buildroot
- Key Decisions
- Choosing the C library: glibc, uClibc, or musl?
- Selecting the init system: busybox vs. sysVinit vs. systemd
- Managing device nodes in /dev
- Choosing additional packages
- Understanding Build Instructions
- Syntax of Kconfig (Config.in) files
- GNU Make features utilized by Buildroot Makefiles
- Style guide for Config.in and *.mk files
- Incorporating a simple Autotools-based package
- Distinguishing between staging and target directories
- The necessity of host packages
- Expressing dependencies and optional features
- Support for languages other than C and build systems beyond Autotools
- Debugging Makefiles
- Rebuilding a single package
- Analyzing Build Results
- Identifying sources of excessive build time
- Identifying sources of excessive disk space usage
- Determining why a specific package was built
- Organizing external package trees
- Workflow for Application Developers
- Using a local source directory
- Overriding build instructions
- Debugging your application
- Accelerating rebuilds
- Viewing build logs
- Addressing Common Cross-Compilation Issues
- Writing software that is compatible with cross-compilers
- Workflow for Kernel Developers
- Understanding how the kernel boots on an embedded system
- Modifying configuration options and applying patches
- Mechanisms for module loading
- Finalizing the Product
- Configuring daemons to run at startup
- Providing custom configuration files
- Available firmware update mechanisms
- Upgrading to a new version of Buildroot
- Complying with open-source licenses
Requirements
- Participants must have compiled a kernel at least once for a traditional desktop (non-embedded) Linux system.
- Understanding of the components that make up the Linux userspace on a desktop system.
- Knowledge of how to generate and apply patches.
- Ability to explain GNU Make, Autotools, and identify other existing build systems.
- Ideally, the participant maintains at least one Linux package, either as an upstream author or within a traditional Linux desktop distribution.
- Previous experience with embedded development is not required and does not substitute for the knowledge of traditional Linux desktops outlined above.
7 Hours
