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  • Book Overview & Buying 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
5 (8)
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Embedded Linux Development with Yocto Project

Embedded Linux Development with Yocto Project

5 (8)
By: Otavio Salvador
Buy this Book

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 (20 chapters)
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Preface
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Preface
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Who this book is for
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What this book covers
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To get the most out of this book
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Download the color images
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Conventions used
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Get in touch
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Share Your Thoughts
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Download a free PDF copy of this book
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1
Chapter 1: Meeting the Yocto Project
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Chapter 1: Meeting the Yocto Project
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What is the Yocto Project?
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Delineating the Yocto Project
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The alliance of the OpenEmbedded project and the Yocto Project
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Understanding Poky
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The Yocto Project releases
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Summary
2
Chapter 2: Baking Our First Poky-Based System
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Chapter 2: Baking Our First Poky-Based System
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Preparing the build host system
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Downloading the Poky source code
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Preparing the build environment
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Knowing the local.conf file
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Building a target image
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Running images in QEMU
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Summary
3
Chapter 3: Using Toaster to Bake an Image
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Chapter 3: Using Toaster to Bake an Image
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What is Toaster?
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Installing Toaster
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Starting Toaster
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Building an image for QEMU
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Summary
4
Chapter 4: Meeting the BitBake Tool
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Chapter 4: Meeting the BitBake Tool
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Understanding the BitBake tool
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BitBake metadata collections
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Metadata types
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Summary
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Chapter 5: Grasping the BitBake Tool
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Chapter 5: Grasping the BitBake Tool
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Parsing metadata
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Dependencies
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Preferring and providing recipes
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Fetching the source code
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Optimizing the source code download
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Understanding BitBake’s tasks
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Summary
6
Chapter 6: Detailing the Temporary Build Directory
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Chapter 6: Detailing the Temporary Build Directory
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Detailing the build directory
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Constructing the build directory
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Exploring the temporary build directory
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Understanding the work directory
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Understanding the sysroot directories
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Summary
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Chapter 7: Assimilating Packaging Support
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Chapter 7: Assimilating Packaging Support
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Using supported package formats
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Running code during package installation
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Understanding shared state cache
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Explaining package versioning
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Specifying runtime package dependencies
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Using packages to generate a rootfs image
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Package feeds
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Summary
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Chapter 8: Diving into BitBake Metadata
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Chapter 8: Diving into BitBake Metadata
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Understanding BitBake’s metadata
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Summary
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Chapter 9: Developing with the Yocto Project
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Chapter 9: Developing with the Yocto Project
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What is a software development kit?
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Generating a native SDK for on-device development
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Understanding the types of cross-development SDKs
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Using the Standard SDK
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Using the Extensible SDK
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Summary
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Chapter 10: Debugging with the Yocto Project
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Chapter 10: Debugging with the Yocto Project
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Differentiating metadata and application debugging
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Tracking image, package, and SDK contents
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Debugging packaging
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Logging information during task execution
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Debugging metadata variables
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Utilizing a development shell
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Using the GNU Debugger for debugging
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Summary
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Chapter 11: Exploring External Layers
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Chapter 11: Exploring External Layers
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Powering flexibility with layers
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Detailing a layer’s source code
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Adding meta layers
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The Yocto Project layer ecosystem
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Summary
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Chapter 12: Creating Custom Layers
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Chapter 12: Creating Custom Layers
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Making a new layer
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Adding metadata to the layer
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MACHINE_FEATURES versus DISTRO_FEATURES
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Understanding the scope of a variable
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Summary
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Chapter 13: Customizing Existing Recipes
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Chapter 13: Customizing Existing Recipes
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Understanding common use cases
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Adding extra options to recipes based on Autotools
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Applying a patch
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Adding extra files to the existing packages
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Configuration fragments for Kconfig-based projects
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Summary
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Chapter 14: Achieving GPL Compliance
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Chapter 14: Achieving GPL Compliance
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Understanding copyleft
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Managing software licensing with Poky
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Using Poky to achieve copyleft compliance
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Summary
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Chapter 15: Booting Our Custom Embedded Linux
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Chapter 15: Booting Our Custom Embedded Linux
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Discovering the right BSP layer
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Using physical hardware
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BeagleBone Black
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Raspberry Pi 4
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VisionFive
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Taking the next steps
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Summary
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Chapter 16: Speeding Up Product Development through Emulation – QEMU
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Chapter 16: Speeding Up Product Development through Emulation – QEMU
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What is QEMU?
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What are the benefits of using QEMU over hardware?
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When is choosing real hardware preferable?
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Using runqemu capabilities
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Summary
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Chapter 17: Best Practices
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Chapter 17: Best Practices
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Guidelines to follow for Yocto Project
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Guidelines to follow for general projects
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Summary
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Index
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Index
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Why subscribe?
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Other Books You May Enjoy
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Other Books You May Enjoy
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Packt is searching for authors like you
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Share Your Thoughts
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Download a free PDF copy of this book

Detailing the build directory

The build directory is a central information and artifact source for every Yocto Project's tool user. Its main directories are the following:

  • conf: This has the configuration files we use to control Poky and BitBake. The first use of this directory was in Chapter 2, Baking Our Poky-based System. It stores configuration files such as build/conf/local.conf and build/conf/bblayers.conf.

  • downloads: This stores the downloaded tarballs. It can be seen as the download cache and has been detailed in Chapter 4, Grasping the BitBake Tool.

  • sstate-cache: This has the packaged data snapshots. It is a cache mainly used to speed up the build process. This folder is detailed in Chapter 6, Assimilating Packaging Support.

  • tmp: This is a temporary build directory. It is very handy; we will understand it better in the following sections.

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Embedded Linux Development with Yocto Project
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