Book Image

Embedded Linux Development Using Yocto Project Cookbook - Second Edition

By : Alex Gonzalez
Book Image

Embedded Linux Development Using Yocto Project Cookbook - Second Edition

By: Alex Gonzalez

Overview of this book

The Yocto Project has become the de facto distribution build framework for reliable and robust embedded systems with a reduced time to market.You'll get started by working on a build system where you set up Yocto, create a build directory, and learn how to debug it. Then, you'll explore everything about the BSP layer, from creating a custom layer to debugging device tree issues. In addition to this, you’ll learn how to add a new software layer, packages, data, scripts, and configuration files to your system. You will then cover topics based on application development, such as using the Software Development Kit and how to use the Yocto project in various development environments. Toward the end, you will learn how to debug, trace, and profile a running system. This second edition has been updated to include new content based on the latest Yocto release.
Table of Contents (13 chapters)
Title Page
Packt Upsell

Building the Linux kernel

As was the case with U-Boot, Linux kernel development is quicker and less error-prone when using the Yocto SDK to build it. However, for smaller changes, the Yocto build system can also be used.

In this recipe, we will show you how to build and modify the Linux kernel source both with Yocto's SDK and the Yocto build system, and boot our target device with it.

How to do it...

We will use the Yocto Project's SDK already installed in your host:

  1. Prepare the environment as follows:
$ source /opt/poky/2.4/environment-setup-cortexa9hf-neon-poky-linux-gnueabi
  1. Configure the kernel with the default machine configuration:
$ cd /opt/yocto/linux-wandboard$ cp /opt/yocto/fsl-community-bsp/sources/meta-bsp-custom/recipes-kernel/linux/linux-wandboard-4.1-2.0.x/wandboard-custom/defconfig arch/arm/configs/wandboard_defconfig$ make wandboard_defconfig
  1. Compile the kernel image, modules, and the device tree file with the following:
$ make -jN


You can optionally pass a -jN argument to make...