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Mastering Embedded Linux Programming

You're reading from   Mastering Embedded Linux Programming Create fast and reliable embedded solutions with Linux 5.4 and the Yocto Project 3.1 (Dunfell)

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Product type Paperback
Published in May 2021
Publisher Packt
ISBN-13 9781789530384
Length 758 pages
Edition 3rd Edition
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Authors (2):
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Frank Vasquez Frank Vasquez
Author Profile Icon Frank Vasquez
Frank Vasquez
Mr. Chris Simmonds Mr. Chris Simmonds
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Mr. Chris Simmonds
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Toc

Table of Contents (27) Chapters Close

Preface 1. Section 1: Elements of Embedded Linux
2. Chapter 1: Starting Out FREE CHAPTER 3. Chapter 2: Learning about Toolchains 4. Chapter 3: All about Bootloaders 5. Chapter 4: Configuring and Building the Kernel 6. Chapter 5: Building a Root Filesystem 7. Chapter 6: Selecting a Build System 8. Chapter 7: Developing with Yocto 9. Chapter 8: Yocto Under the Hood 10. Section 2: System Architecture and Design Decisions
11. Chapter 9: Creating a Storage Strategy 12. Chapter 10: Updating Software in the Field 13. Chapter 11: Interfacing with Device Drivers 14. Chapter 12: Prototyping with Breakout Boards 15. Chapter 13: Starting Up – The init Program 16. Chapter 14: Starting with BusyBox runit 17. Chapter 15: Managing Power 18. Section 3: Writing Embedded Applications
19. Chapter 16: Packaging Python 20. Chapter 17: Learning about Processes and Threads 21. Chapter 18: Managing Memory 22. Section 4: Debugging and Optimizing Performance
23. Chapter 19: Debugging with GDB 24. Chapter 20: Profiling and Tracing 25. Chapter 21: Real-Time Programming 26. Other Books You May Enjoy

Decomposing Yocto's architecture and workflow

Yocto is a complex beast. Taking it apart is the first step toward understanding it. The architecture of a build system can be organized in terms of its workflow. Yocto gets its workflow from the OpenEmbbedded project, which it is based on. Source materials feed into the system as inputs by way of metadata in the form of BitBake recipes. The build system uses this metadata to fetch, configure, and compile the source code into binary package feeds. These individual output packages are assembled inside a staging area before the finished Linux image and SDK are generated, complete with a manifest that includes a license for each package that's on board:

Figure 8.1 – OpenEmbedded architecture workflow

Figure 8.1 – OpenEmbedded architecture workflow

Here are the seven steps of Yocto's build system workflow, as shown in the
preceding diagram:

  1. Define layers for policy, machine, and software metadata.
  2. Fetch sources from the source...
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