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Embedded Linux Development using Yocto Projects

Embedded Linux Development using Yocto Projects

By : Otavio Salvador, Angolini
3.4 (5)
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Embedded Linux Development using Yocto Projects

Embedded Linux Development using Yocto Projects

3.4 (5)
By: Otavio Salvador, Angolini

Overview of this book

Yocto Project is turning out to be the best integration framework for creating reliable embedded Linux projects. It has the edge over other frameworks because of its features such as less development time and improved reliability and robustness. Embedded Linux Development using Yocto Project starts with an in-depth explanation of all Yocto Project tools, to help you perform different Linux-based tasks. The book then moves on to in-depth explanations of Poky and BitBake. It also includes some practical use cases for building a Linux subsystem project using Yocto Project tools available for embedded Linux. The book also covers topics such as SDK, recipetool, and others. By the end of the book, you will have learned how to generate and run an image for real hardware boards and will have gained hands-on experience at building efficient Linux systems using Yocto Project.
Table of Contents (15 chapters)
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7
Diving into BitBake Metadata

Customizing BusyBox


BusyBox is a key component of most embedded, Linux-based projects as it provides an alternative to the most commonly used utilities, butwith a smaller footprint than its usual Linux counterparts. It can be seen as a sort of Swiss Army knife, since it provides a huge set of utilities and is quite flexible regarding which utilities to enable or disable.

Note

When we want to deselect an option, we can add a negative line instead, for example, CONFIG_TFTPD=n.

Poky provides a default setting for BusyBox, and it may sometimes not fulfill our needs, so changing this configuration is a common task. For example, the <layer>/recipes-core/busybox/busybox_%.bbappend file could have the following lines of code:

FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
SRC_URI += "file://enable-tftpd.cfg"

The <layer>/recipes-core/busybox/busybox/enable-tftpd.cfg file contains the following:

CONFIG_TFTPD=y

This combination of the .bbappend file and configuration file is enough to enable support...

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