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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

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Product type Paperback
Published in Jan 2018
Publisher
ISBN-13 9781788399210
Length 456 pages
Edition 2nd Edition
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Author (1):
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Alex Gonzalez Alex Gonzalez
Author Profile Icon Alex Gonzalez
Alex Gonzalez
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Table of Contents (7) Chapters Close

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

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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