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  • Book Overview & Buying Embedded Linux Projects Using Yocto Project Cookbook
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Embedded Linux Projects Using Yocto Project Cookbook

Embedded Linux Projects Using Yocto Project Cookbook

By : Alex Gonzalez
3.8 (8)
Buy this Book
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Embedded Linux Projects Using Yocto Project Cookbook

Embedded Linux Projects Using Yocto Project Cookbook

3.8 (8)
By: Alex Gonzalez
Buy this Book

Overview of this book

If you are an embedded developer learning about embedded Linux with some experience with the Yocto project, this book is the ideal way to become proficient and broaden your knowledge with examples that are immediately applicable to your embedded developments. Experienced embedded Yocto developers will find new insight into working methodologies and ARM specific development competence.
Table of Contents (7 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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Get in touch
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1
The Build System
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The Build System
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Introduction
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Setting up the host system
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Installing Poky
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Creating a build directory
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Building your first image
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Explaining the NXP Yocto ecosystem
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Installing support for NXP hardware
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Building Wandboard images
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Using the Toaster web interface
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Running a Toaster Docker container
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Configuring network booting for a development setup
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Using Docker as a Yocto build system container
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Sharing downloads
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Sharing the shared state cache
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Setting up a package feed
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Using build history
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Working with build statistics
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Debugging the build system
2
The BSP Layer
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The BSP Layer
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Introduction
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Creating a custom BSP layer
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Adding a custom kernel and bootloader
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Building the U-Boot bootloader
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Describing Linux's build system
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Configuring the Linux kernel
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Building the Linux kernel
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Building external kernel modules
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Debugging the Linux kernel and modules
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Debugging the Linux kernel booting process
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Using the kernel function tracing system
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Managing the device tree
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Debugging device tree issues
3
The Software Layer
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The Software Layer
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Introduction
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Exploring an image's contents
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Adding a new software layer
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Selecting a specific package version and provider
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Adding supported packages
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Adding new packages
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Adding data, scripts, or configuration files
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Managing users and groups
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Using the sysvinit initialization manager
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Using the systemd initialization manager
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Installing package installation scripts
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Reducing the Linux kernel image size
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Reducing the root filesystem size
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Memory-based root filesystems
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Securing the root filesystem
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Releasing software
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Analyzing your system for compliance
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Working with open source and proprietary code
4
Application Development
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Application Development
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Introduction
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Introducing toolchains
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Preparing an SDK
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Using the extensible SDK
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Using the Eclipse IDE
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Developing GTK+ applications
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Using the Qt Creator IDE
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Developing Qt applications
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Describing workflows for application development
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Working with GNU make
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Working with the GNU build system
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Working with the CMake build system
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Working with the SCons builder
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Developing with libraries
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Working with the Linux framebuffer
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Using the X Windows system
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Using Wayland
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Adding a web browser application
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Adding Python applications
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Integrating the Open Java Development Kit
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Integrating Java applications
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Integrating Node.js applications
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Running Docker application containers
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Debugging, Tracing, and Profiling
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Debugging, Tracing, and Profiling
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Introduction
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Analyzing core dumps
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Native GDB debugging
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Cross GDB debugging
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Using strace for application debugging
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Using the kernel's performance counters
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Using static kernel tracing
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Using dynamic kernel tracing
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Using dynamic kernel events
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Exploring Yocto's tracing and profiling tools
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Tracing and profiling with perf
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Using SystemTap
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Using LTTng
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Using blktrace
6
Other Books You May Enjoy
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Other Books You May Enjoy
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Leave a review - let other readers know what you think

Installing support for Freescale hardware

In this recipe, we will install the community Freescale BSP Yocto release that adds support for Freescale hardware to our Yocto installation.

Getting ready

With so many layers, manually cloning each of them and adding them to your project's conf/bblayers.conf file is cumbersome. The community is using the repo tool developed by Google for their community Android to ease the installation of Yocto.

To install repo in your host system, type in the following commands:

$ sudo curl http://commondatastorage.googleapis.com/git-repo- downloads/repo > /usr/local/sbin/repo
$ sudo chmod a+x /usr/local/sbin/repo

The repo tool is a Python utility that parses an XML file, called manifest, with a list of Git repositories. The repo tool is then used to manage those repositories as a whole.

How to do it...

For example, we will use repo to download all the repositories listed in the previous recipe to our host system. For that, we will point it to the Freescale community BSP manifest for the Dizzy release:

<?xml version="1.0" encoding="UTF-8"?>
<manifest>
  <default sync-j="4" revision="master"/>
  <remote fetch="git://git.yoctoproject.org" name="yocto"/>
  <remote fetch="git://github.com/Freescale" name="freescale"/>
  <remote fetch="git://git.openembedded.org" name="oe"/>
  <project remote="yocto" revision="dizzy" name="poky" path="sources/poky"/>
  <project remote="yocto" revision="dizzy" name="meta-fsl-arm" path="sources/meta-fsl-arm"/>
  <project remote="oe" revision="dizzy" name="meta-openembedded" path="sources/meta-openembedded"/>
  <project remote="freescale" revision="dizzy" name="fsl- community-bsp-base" path="sources/base">
        <copyfile dest="README" src="README"/>
        <copyfile dest="setup-environment" src="setup- environment"/>
  </project>
  <project remote="freescale" revision="dizzy" name="meta-fsl-arm- extra" path="sources/meta-fsl-arm-extra"/>
  <project remote="freescale" revision="dizzy" name="meta-fsl- demos" path="sources/meta-fsl-demos"/>
  <project remote="freescale" revision="dizzy" name="Documentation" path="sources/Documentation"/>
</manifest>

The manifest file shows all the installation paths and repository sources for the different components that are going to be installed.

How it works...

The manifest file is a list of the different layers that are needed for the Freescale community BSP release. We can now use repo to install it. Run the following:

$ mkdir /opt/yocto/fsl-community-bsp
$ cd /opt/yocto/fsl-community-bsp
$ repo init -u https://github.com/Freescale/fsl-community-bsp- platform -b dizzy
$ repo sync

You can optionally pass a -jN argument to sync if you have a multicore machine for multithreaded operations; for example, you could pass repo sync -j8 in an 8-core host system.

There's more...

To list the hardware boards supported by the different layers, we may run:

$ ls sources/meta-fsl*/conf/machine/*.conf

And to list the newly introduced target images, use the following:

$ ls sources/meta-fsl*/recipes*/images/*.bb

The community Freescale BSP release introduces the following new target images:

  • fsl-image-mfgtool-initramfs: This is a small, RAM-based initramfs image used with the Freescale manufacturing tool
  • fsl-image-multimedia: This is a console-only image that includes the gstreamer multimedia framework over the framebuffer, if applicable
  • fsl-image-multimedia-full: This is an extension of fsl-image-multimedia, but extends the gstreamer multimedia framework to include all available plugins
  • fsl-image-machine-test: This is an extension on fsl-image-multimedia-full for testing and benchmarking
  • qte-in-use-image: This is a graphical image that includes support for Qt4 over the framebuffer
  • qt-in-use-image: This is a graphical image that includes support for Qt4 over the X11 Windows system

See also

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