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Embedded Linux Projects Using Yocto Project Cookbook

By : Alex González

4.4 (13)

Embedded Linux Projects Using Yocto Project Cookbook

4.4 (13)

By: Alex González

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.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Sections

Conventions

Reader feedback

Customer support

Free Chapter

1. The Build System

1. The Build System

Introduction

Setting up the host system

Installing Poky

Creating a build directory

Building your first image

Explaining the Freescale Yocto ecosystem

Installing support for Freescale hardware

Building Wandboard images

Troubleshooting your Wandboard's first boot

Configuring network booting for a development setup

Sharing downloads

Sharing the shared state cache

Setting up a package feed

Using build history

Working with build statistics

Debugging the build system

2. The BSP Layer

2. The BSP Layer

Introduction

Creating a custom BSP layer

Introducing system development workflows

Adding a custom kernel and bootloader

Building the U-Boot bootloader

Explaining Yocto's Linux kernel support

Describing Linux's build system

Configuring the Linux kernel

Building the Linux kernel

Building external kernel modules

Debugging the Linux kernel and modules

Debugging the Linux kernel booting process

Using the kernel function tracing system

Managing the device tree

Debugging device tree issues

3. The Software Layer

3. The Software Layer

Introduction

Exploring an image's contents

Adding a new software layer

Selecting a specific package version and providers

Adding supported packages

Adding new packages

Adding data, scripts, or configuration files

Managing users and groups

Using the sysvinit initialization manager

Using the systemd initialization manager

Installing package-installation scripts

Reducing the Linux kernel image size

Reducing the root filesystem image size

Releasing software

Analyzing your system for compliance

Working with open source and proprietary code

4. Application Development

4. Application Development

Introduction

Introducing toolchains

Preparing and using an SDK

Using the Application Development Toolkit

Using the Eclipse IDE

Developing GTK+ applications

Using the Qt Creator IDE

Developing Qt applications

Describing workflows for application development

Working with GNU make

Working with the GNU build system

Working with the CMake build system

Working with the SCons builder

Developing with libraries

Working with the Linux framebuffer

Using the X Windows system

Using Wayland

Adding Python applications

Integrating the Oracle Java Runtime Environment

Integrating the Open Java Development Kit

Integrating Java applications

5. Debugging, Tracing, and Profiling

5. Debugging, Tracing, and Profiling

Introduction

Analyzing core dumps

Native GDB debugging

Cross GDB debugging

Using strace for application debugging

Using the kernel's performance counters

Using static kernel tracing

Using dynamic kernel tracing

Using dynamic kernel events

Exploring Yocto's tracing and profiling tools

Tracing and profiling with perf

Using SystemTap

Using OProfile

Using LTTng

Using blktrace

Index

Index

Customer Reviews

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Building Wandboard images

Building images for one of the supported boards (for example, Wandboard Quad) follows the same process we described earlier for the QEMU machines, with the exception of using the setup-environment script, which is a wrapper around oe-init-build-env.

How to do it...

To build an image for the wandboard-quad machine, use the following commands:

$ cd /opt/yocto/fsl-community-bsp
$ mkdir -p wandboard-quad
$ MACHINE=wandboard-quad source setup-environment wandboard-quad
$ bitbake core-image-minimal

Note

The current version of the setup-environment script only works if the build directory is under the installation folder; in our case, /opt/yocto/fsl-community-bsp.

How it works...

The setup-environment script will create a build directory, set up the MACHINE variable, and prompt you to accept the Freescale EULA as described earlier. Your conf/local.conf configuration file will be updated both with the specified machine and the EULA acceptance variable.

Note

Remember that if you close your terminal session, you will need to set up the environment again before being able to use BitBake. You can safely rerun the setup-environment script as seen previously, as it will not touch an existing conf/local.conf file. Run the following:

$ cd /opt/yocto/fsl-community-bsp/
$ source setup-environment wandboard-quad

The resulting image, core-image-minimal.sdcard, which is created inside the build directory, can be programmed into a microSD card, inserted into the primary slot in the Wandboard CPU board, and booted using the following commands:

$ cd /opt/yocto/fsl-community-bsp/wandboard- quad/tmp/deploy/images/wandboard-quad/
$ sudo dd if=core-image-minimal.sdcard of=/dev/sdN bs=1M && sync

Here, /dev/sdN corresponds to the device node assigned to the microSD card in your host system.

Tip

Be careful when running the dd command, as it could harm your machine. You need to be absolutely sure that the sdN device corresponds to your microSD card and not a drive on your development machine.

See also

You can find more information regarding the repo tool on Android's documentation at https://source.android.com/source/using-repo.html

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