Buildroot: a Firmware Generator for Embedded Systems Schulung

Kurs Code

buildroot

Dauer

7 hours (üblicherweise 1 Tag inklusive Pausen)

Voraussetzungen

  • The participant must have built a kernel at least once for a traditional desktop (non-embedded) Linux system.
  • Knows what components the Linux userspace on a desktop system is composed of.
  • Knows how to generate and use patches.
  • Must be able to explain what is GNU Make, Autotools, what other build systems exist.
  • Ideally, maintains at least one Linux package, either as an upstream author, or in any traditional Linux desktop distribution.
  • Prior experience with embedded development is not required, and is not a substitute for the knowledge about traditional Linux desktops specified above.

Überblick

Buildroot ist ein Open-Source-Projekt, das Skripts enthält, die eine kompilierungsübergreifende Toolchain, ein anpassbares Root-Dateisystem-Image und einen Linux Kernel für eingebettete Geräte erstellen. Während dieses Praktikums lernen die Teilnehmer, wie man es benutzt:

  • So wählen Sie Software aus, die in das Root-Dateisystem aufgenommen wird.
  • So fügen Sie neue Pakete hinzu und ändern vorhandene.
  • So fügen Sie Unterstützung für neue Embedded-Boards hinzu.

Während des Kurses werden bootfähige Dateisystem-Images erstellt. Fernkurse werden mit dem QEMU- Emulator angeboten, während im Klassenzimmer entweder QEMU oder echte Embedded-Boards nach Wahl des Trainers verwendet werden können.

Weitere Projekte mit ähnlichen Zielen sind das Yocto-Projekt und OpenWRT. Verwenden Sie diese Präsentationen, um festzustellen, welche für Ihre Anforderungen die richtige ist.

Machine Translated

Schulungsübersicht

  1. Getting started
    1. Obtaining Buildroot
    2. Build system requirements
    3. Cross-compiler terminology: build, host, target, sysroot
    4. Choosing the correct target
    5. Building a minimal embedded system and booting it
    6. Contents of the resulting filesystem image
    7. Parallel builds
    8. Full and partial rebuilds
  2. Design goals of Buildroot
  3. Choices to be made
    1. C library: glibc or uClibc or musl?
    2. Init system: busybox vs sysVinit vs systemd
    3. Managing device nodes in /dev
    4. Selecting other packages
  4. Understanding the build instructions
    1. Syntax of Kconfig (Confog.in) files
    2. Features of GNU Make used by Buidroot Makefiles
    3. Style guide for Config.in and *.mk files
    4. How to add a simple Autotools-based package
    5. The difference between staging and target directories
    6. The need for host packages
    7. How to express dependencies and optional features
    8. Support for languages other than C and build systems other than Autotools
    9. Debugging Makefiles
    10. Rebuilding a single package
  5. Analyzing the build results
    1. What took so much build time?
    2. What took so much disk space?
    3. Why has this package been built?
  6. Organizing external package trees
  7. Workflow for application developers
    1. How to use a local source directory
    2. Overriding build instructions
    3. Debugging your application
    4. Speeding up rebuilds
    5. Viewing build logs
  8. Dealing with common cross-compilation issues
    1. How to write your own software so that it is friendly to cross-compilers
  9. Workflow for kernel developers
    1. How the kernel boots on an embedded system
    2. Changing configuration options and adding patches
    3. Module loading mechanisms
  10. Making a finished product
    1. Running daemons at startup
    2. Providing custom configuration files
    3. Available firmware update mechanisms
    4. Upgrading to a new Buildroot version
    5. Complying with open-source licenses

Erfahrungsberichte

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