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Embedded Linux Development Using Yocto Project

You're reading from   Embedded Linux Development Using Yocto Project Leverage the power of the Yocto Project to build efficient Linux-based products

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Product type Paperback
Published in Apr 2023
Publisher Packt
ISBN-13 9781804615065
Length 196 pages
Edition 3rd Edition
Tools
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Authors (2):
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Otavio Salvador Otavio Salvador
Author Profile Icon Otavio Salvador
Otavio Salvador
Daiane Angolini Daiane Angolini
Author Profile Icon Daiane Angolini
Daiane Angolini
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Toc

Table of Contents (20) Chapters Close

Preface 1. Chapter 1: Meeting the Yocto Project 2. Chapter 2: Baking Our First Poky-Based System FREE CHAPTER 3. Chapter 3: Using Toaster to Bake an Image 4. Chapter 4: Meeting the BitBake Tool 5. Chapter 5: Grasping the BitBake Tool 6. Chapter 6: Detailing the Temporary Build Directory 7. Chapter 7: Assimilating Packaging Support 8. Chapter 8: Diving into BitBake Metadata 9. Chapter 9: Developing with the Yocto Project 10. Chapter 10: Debugging with the Yocto Project 11. Chapter 11: Exploring External Layers 12. Chapter 12: Creating Custom Layers 13. Chapter 13: Customizing Existing Recipes 14. Chapter 14: Achieving GPL Compliance 15. Chapter 15: Booting Our Custom Embedded Linux 16. Chapter 16: Speeding Up Product Development through Emulation – QEMU 17. Chapter 17: Best Practices 18. Index 19. Other Books You May Enjoy

Optimizing the source code download

To improve the robustness of source code download, Poky provides a mirror mechanism that can provide the following:

  • A centrally preferred server for download
  • A set of fallback servers

To provide this robust download mechanism, BitBake follows defined logic steps. During the build, the first BitBake step is to search for the source code within the local download directory (specified by DL_DIR). If this fails, the next step is to try the locations defined by the PREMIRRORS variable. Finally, BitBake searches the locations specified in the MIRRORS variable in a failure case. In summary, these steps are as follows:

  1. DL_DIR: Look for the download on the host machine.
  2. MIRRORS: Search for the download in a list of mirrors.
  3. PREMIRRORS: This is used to reduce the download from external servers and is usually used inside companies to reduce or forbid internet use.

For example, when configuring a local server, https...

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