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  • Embedded Linux Development with Yocto Project
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Embedded Linux Development with Yocto Project

Embedded Linux Development with Yocto Project

By : Otavio Salvador
3.9 (20)
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Embedded Linux Development with Yocto Project

Embedded Linux Development with Yocto Project

3.9 (20)
By: Otavio Salvador

Overview of this book

A practical tutorial guide which introduces you to the basics of Yocto Project, and also helps you with its real hardware use to boost your Embedded Linux-based project. If you are an embedded systems enthusiast and willing to learn about compelling features offered by the Yocto Project, then this book is for you. With prior experience in the embedded Linux domain, you can make the most of this book to efficiently create custom Linux-based systems.
Table of Contents (17 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Meeting the Yocto Project
1. Meeting the Yocto Project
What is the Yocto Project?
Delineating the Yocto Project
Understanding Poky
The alliance of OpenEmbedded Project and Yocto Project
Summary
2
2. Baking Our Poky-based System
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2. Baking Our Poky-based System
Configuring a host system
Downloading the Poky source code
Preparing the build environment
Knowing the local.conf file
Building a target image
Running images in QEMU
Summary
3
3. Using Hob to Bake an Image
3. Using Hob to Bake an Image
Building an image using Hob
Customizing an image with Hob
Summary
4
4. Grasping the BitBake Tool
4. Grasping the BitBake Tool
Understanding the BitBake tool
Exploring metadata
Parsing metadata
Dependencies
Preferring and providing recipes
Fetching the source code
Understanding BitBake's tasks
Generating a root filesystem image
Summary
5
5. Detailing the Temporary Build Directory
5. Detailing the Temporary Build Directory
Detailing the build directory
Constructing the build directory
Exploring the temporary build directory
Understanding the work directory
Understanding the sysroot directories
Summary
6
6. Assimilating Packaging Support
6. Assimilating Packaging Support
Using supported package formats
Understanding shared state cache
Explaining package versioning
Package feeds
Summary
7
7. Diving into BitBake Metadata
7. Diving into BitBake Metadata
Using metadata
Working with metadata
Summary
8
8. Developing with the Yocto Project
8. Developing with the Yocto Project
Deciphering the software development kit
Working with the Poky SDK
Developing applications on the target
Integrating with Eclipse
Summary
9
9. Debugging with the Yocto Project
9. Debugging with the Yocto Project
Differentiating metadata and application debugging
Tracking image, package, and SDK contents
Debugging packaging
Logging information during task execution
Utilizing a development shell
Using the GNU Project Debugger for debugging
Summary
10
10. Exploring External Layers
10. Exploring External Layers
Powering flexibility with layers
Detailing the layer's source code
Adding meta layers
Summary
11
11. Creating Custom Layers
11. Creating Custom Layers
Making a new layer
Adding metadata to the layer
Creating an image
Adding a package recipe
Writing a machine definition
Using a custom distribution
Machine features versus distro features
Understanding the variables scope
Summary
12
12. Customizing Existing Recipes
12. Customizing Existing Recipes
Common use cases
Adding extra options to recipes based on Autoconf
Applying a patch
Adding extra files to the existing packages
Changing recipe feature configuration
Customizing BusyBox
Customizing the linux-yocto framework
Summary
13
13. Achieving GPL Compliance
13. Achieving GPL Compliance
Understanding copyleft
Managing software licensing with Poky
Using Poky to achieve copyleft compliance
Summary
14
14. Booting Our Custom Embedded Linux
14. Booting Our Custom Embedded Linux
Exploring the Wandboard
Discovering Freescale ARM BSP
Using Wandboard with the Yocto Project
Building an image for Wandboard
Booting Wandboard from the SD card
Summary
15
A. References
A. References
16
Index
Index

Knowing the local.conf file

When we initialize a build environment, it creates a file called build/conf/local.conf, which is a powerful tool that can configure almost every aspect of the build process. We can set the machine we are building for, choose the toolchain host architecture to be used for a custom cross-toolchain, optimize options for maximum build time reduction, and so on. The comments inside the build/conf/local.conf file are a very good documentation and reference of possible variables, and their defaults. The minimal set of variables we probably want to change from the default is the following:

BB_NUMBER_THREADS ?= "${@oe.utils.cpu_count()}"
PARALLEL_MAKE ?= "-j ${@oe.utils.cpu_count()}"
MACHINE ??= "qemux86"

Tip

BB_NUMBER_THREADS and PARALLEL_MAKE should be set to twice the host processor's number of cores.

The MACHINE variable is where we determine the target machine we wish to build for. At the time of writing this book, Poky supports the...

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