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Mastering Embedded Linux Development

You're reading from   Mastering Embedded Linux Development Craft fast and reliable embedded solutions with Linux 6.6 and The Yocto Project 5.0 (Scarthgap)

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Product type Paperback
Published in May 2025
Publisher Packt
ISBN-13 9781803232591
Length 710 pages
Edition 4th Edition
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Authors (2):
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Frank Vasquez Frank Vasquez
Author Profile Icon Frank Vasquez
Frank Vasquez
Chris Simmonds Chris Simmonds
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Chris Simmonds
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Toc

Table of Contents (28) Chapters Close

Preface 1. Part 1: Elements of Embedded Linux
2. Starting Out FREE CHAPTER 3. Learning about Toolchains 4. All about Bootloaders 5. Configuring and Building the Kernel 6. Building a Root Filesystem 7. Part 2: Building Embedded Linux Images
8. Selecting a Build System 9. Developing with Yocto 10. Yocto under the Hood 11. Part 3: System Architecture and Design Decisions
12. Creating a Storage Strategy 13. Updating Software in the Field 14. Interfacing with Device Drivers 15. Prototyping with Add-On Boards 16. Starting Up – The init Program 17. Managing Power 18. Part 4: Developing Applications
19. Packaging Python 20. Deploying Container Images 21. Learning about Processes and Threads 22. Managing Memory 23. Part 5: Debugging and Optimizing Performance
24. Debugging with GDB 25. Profiling and Tracing 26. Real-Time Programming 27. Index

Putting the system to sleep

There is one more power management technique to consider: putting the whole system into sleep mode with the expectation that it will not be used again for a while. In the Linux kernel, this is known as system sleep. It is usually user-initiated: the user decides that the device should be shut down for a while. For example, I shut the lid of my laptop and put it in my bag when it is time to go home. Much of the support for system sleep in Linux comes from the support for laptops. In the laptop world, there are usually two options:

  • Suspend
  • Hibernate

The first, also known as suspend to RAM, shuts everything down except the system memory, so the machine is still consuming a little power. When the system wakes up, the memory retains all the previous state, and my laptop is operational within a few seconds.

If I select the hibernate option, the contents of the memory are saved to the hard drive. The system consumes no power at all...

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