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You're reading from  Embedded Linux Development Using Yocto Project Cookbook. - Second Edition

Product typeBook
Published inJan 2018
Publisher
ISBN-139781788399210
Edition2nd Edition
Tools
Yocto ProjectLinux
Concepts
Embedded Systems
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Author (1)
Alex Gonzalez
Alex Gonzalez
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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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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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Embedded Linux Development Using Yocto Project Cookbook. - Second Edition
Published in: Jan 2018Publisher: ISBN-13: 9781788399210
© 2018 Packt Publishing Limited All Rights Reserved

Author (1)

author image
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.
Read more about Alex Gonzalez

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