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

Working with the SCons builder

SCons is also a multiplatform build system written in Python, with its configuration files also written in the same language. It also includes support for Microsoft Visual Studio, among other features.

Getting ready

SCons parses SConstruct files, and by default it does not propagate the environment into the build system. This is to avoid build issues caused by environment differences. This is a complication for Yocto, as it configures the environment with cross-compilation toolchain settings. SCons does not define a standard way to support cross-compilation, so every project will implement it differently. For a simple example as the helloworld program, we can just initialize the CC, LINKFLAGS and PATH variables in our SConstruct file from the external environment as follows:

import os                                                                        
env = Environment(CC = os.environ['CC'], LINKFLAGS = os.environ['LDFLAGS'], ENV = {'PATH': os.environ['PATH...