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Mastering Embedded Linux Programming

You're reading from   Mastering Embedded Linux Programming Unleash the full potential of Embedded Linux with Linux 4.9 and Yocto Project 2.2 (Morty) Updates

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Product type Paperback
Published in Jun 2017
Publisher Packt
ISBN-13 9781787283282
Length 478 pages
Edition 2nd Edition
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Author (1):
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Mr. Chris Simmonds Mr. Chris Simmonds
Author Profile Icon Mr. Chris Simmonds
Mr. Chris Simmonds
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Table of Contents (17) Chapters Close

Preface 1. Starting Out FREE CHAPTER 2. Learning About Toolchains 3. All About Bootloaders 4. Configuring and Building the Kernel 5. Building a Root Filesystem 6. Selecting a Build System 7. Creating a Storage Strategy 8. Updating Software in the Field 9. Interfacing with Device Drivers 10. Starting Up – The init Program 11. Managing Power 12. Learning About Processes and Threads 13. Managing Memory 14. Debugging with GDB 15. Profiling and Tracing 16. Real-Time Programming

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 or 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...

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