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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

Product type Paperback

Published in Jun 2017

Publisher Packt

ISBN-13 9781787283282

Length 478 pages

Edition 2nd Edition

Tools

Linux

Concepts

System Programming

Author (1):

Mr. Chris Simmonds

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Table of Contents (17) Chapters

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

Read-only compressed filesystems

Compressing data is useful if you don't have quite enough storage to fit everything in. Both JFFS2 and UBIFS do on-the-fly data compression by default. However, if the files are never going to be written, as is usually the case with the root filesystem, you can achieve better compression ratios by using a read-only compressed filesystem. Linux supports several of these: romfs, cramfs, and squashfs. The first two are obsolete now, so I will describe only squashfs.

squashfs

The squashfs filesystem was written by Phillip Lougher in 2002 as a replacement for cramfs. It existed as a kernel patch for a long time, eventually being merged into mainline Linux in version 2.6.29 in 2009. It is very...

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Authors (1)

Chris Simmonds

Chris Simmonds is a software consultant and trainer living in southern England. He has almost two decades of experience in designing and building open-source embedded systems. He is the founder and chief consultant at 2net Ltd, which provides professional training and mentoring services in embedded Linux, Linux device drivers, and Android platform development. He has trained engineers at many of the biggest companies in the embedded world, including ARM, Qualcomm, Intel, Ericsson, and General Dynamics. He is a frequent presenter at open source and embedded conferences, including the Embedded Linux Conference and Embedded World.

See other products by Chris Simmonds