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Embedded Linux Development Using Yocto Project Cookbook

You're reading from Embedded Linux Development Using Yocto Project Cookbook Practical recipes to help you leverage the power of Yocto to build exciting Linux-based systems

Product type Paperback

Published in Jan 2018

Publisher

ISBN-13 9781788399210

Length 456 pages

Edition 2nd Edition

Languages

C

Tools

Linux

Concepts

Embedded Systems

Author (1):

Alex Gonzalez

View More author details

Table of Contents (7) Chapters

Preface

1. The Build System FREE CHAPTER

2. The BSP Layer

3. The Software Layer

4. Application Development

5. Debugging, Tracing, and Profiling

6. Other Books You May Enjoy

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Reducing the Linux kernel image size

Before or in parallel with the root filesystem customization, embedded projects usually require an image size optimization that will reduce the boot time and memory usage.

Smaller images mean less storage space, less transmission time, and less programming time, which saves money both in manufacturing and field updates.

By default, the compressed Linux kernel image (zImage) for the Wandboard is around 6.2 MB. This recipe will show how we can reduce that.

How to do it...

An example of a minimal kernel configuration for a Wandboard that is able to boot from a microSD card root filesystem is the arch/arm/configs/wandboard-custom-minimal_defconfig file:

CONFIG_KERNEL_XZ=y                                                               
# CONFIG_SWAP is not set                                                         
CONFIG_NO_HZ=y                                                                   
CONFIG_HIGH_RES_TIMERS=y                                         ...

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Authors (1)

Alex Gonzalez

Alex Gonzalez

Alex González is a software engineering supervisor at Digi International and product owner of the Digi Embedded Yocto distribution. He started working professionally with embedded systems in 1999 and the Linux kernel in 2004, designing products for voice and video over IP networks, and followed his interests into machine-to-machine (M2M) technologies and the Internet of Things. Born and raised in Bilbao, Spain, Alex has an electronic engineering degree from the University of the Basque Country and he received his MSc in communication systems from the University of Portsmouth.

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