Embedded Linux Development with Yocto Project电子书

Embedded Linux Development with Yocto Project

Table of Contents

Embedded Linux Development with Yocto Project

Credits

About the Authors

About the Reviewers

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Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the color images of the book

Errata

Piracy

Questions

1. Meeting the Yocto Project

What is the Yocto Project?

Delineating the Yocto Project

Understanding Poky

Using BitBake

OpenEmbedded-Core

Metadata

The alliance of OpenEmbedded Project and Yocto Project

Summary

2. Baking Our Poky-based System

Configuring a host system

Installing Poky on Debian

Installing Poky on Fedora

Downloading the Poky source code

Preparing the build environment

Knowing the local.conf file

Building a target image

Running images in QEMU

Summary

3. Using Hob to Bake an Image

Building an image using Hob

Customizing an image with Hob

Summary

4. Grasping the BitBake Tool

Understanding the BitBake tool

Exploring metadata

Parsing metadata

Dependencies

Preferring and providing recipes

Fetching the source code

Remote file downloads

Git repositories

Other repositories

Optimizing the source code download

Disabling network access

Understanding BitBake's tasks

Extending tasks

Generating a root filesystem image

Summary

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. Assimilating Packaging Support

Using supported package formats

List of supported package formats

Choosing a package format

Running code during package installation

Understanding shared state cache

Explaining package versioning

Package feeds

Using package feeds

Summary

7. Diving into BitBake Metadata

Using metadata

Working with metadata

The basic variable setting

Variable expansion

Setting a default value using ?=

Setting a default value using ??=

Immediate variable expansion

Appending and prepending

Conditional metadata set

Conditional appending

File inclusion

Python variable expansion

Defining executable metadata

Defining Python functions in the global namespace

The inheritance system

Summary

8. Developing with the Yocto Project

Deciphering the software development kit

Working with the Poky SDK

Using an image-based SDK

Generic SDK – meta-toolchain

Using a SDK

Developing applications on the target

Integrating with Eclipse

Summary

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. Exploring External Layers

Powering flexibility with layers

Detailing the layer's source code

Adding meta layers

Summary

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. Customizing Existing Recipes

Common use cases

Adding extra options to recipes based on Autoconf

Applying a patch

Adding extra files to the existing packages

Understanding file searching paths

Changing recipe feature configuration

Customizing BusyBox

Customizing the linux-yocto framework

Summary

13. Achieving GPL Compliance

Understanding copyleft

Copyleft compliance versus proprietary code

Some guidelines for license compliance

Managing software licensing with Poky

Commercial licenses

Using Poky to achieve copyleft compliance

License auditing

Providing the source code

Providing compilation scripts and source code modifications

Providing license text

Summary

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

A. References

Index