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Mastering Embedded Linux Programming

You're reading from Mastering Embedded Linux Programming Unleash the full potential of Embedded Linux

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):

Chris Simmonds

View More author details

Table of Contents (23) Chapters

Title Page

Credits

About the Author

About the Reviewers

www.PacktPub.com

Customer Feedback

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

Finding out about drivers at runtime

Once you have a running Linux system, it is useful to know which device drivers are loaded and what state they are in. You can find out a lot by reading the files in /proc and /sys.

First of all, you can list the character and block device drivers currently loaded and active by reading /proc/devices:

# cat /proc/devices
Character devices:
  1 mem 
  2 pty 
  3 ttyp 
  4 /dev/vc/0 
  4 tty 
  4 ttyS 
  5 /dev/tty 
  5 /dev/console 
  5 /dev/ptmx 
  7 vcs 
 10 misc 
 13 input 
 29 fb 
 81 video4linux 
 89 i2c 
 90 mtd 
116 alsa 
128 ptm 
136 pts 
153 spi 
180 usb 
189 usb_device 
204 ttySC 
204 ttyAMA 
207 ttymxc 
226 drm 
239 ttyLP 
240 ttyTHS 
241 ttySiRF 
242 ttyPS 
243 ttyWMT 
244 ttyAS 
245 ttyO 
246 ttyMSM 
247 ttyAML 
248 bsg 
249 iio 
250 watchdog 
251 ptp 
252 pps 
253 media 
254 rtc 

Block devices:
259 blkext 
  7 loop 
  8 sd 
 11 sr 
 31 mtdblock 
 65 sd 
 66 sd 
 67 sd 
 68 sd 
 69 sd 
 70 sd 
 71 sd 
128 sd 
129 sd 
130 sd 
131 sd 
132 sd ...

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Authors (1)

Chris Simmonds

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.

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