Book Image

Mastering Embedded Linux Programming - Third Edition

By : Frank Vasquez, Chris Simmonds
5 (3)
Book Image

Mastering Embedded Linux Programming - Third Edition

5 (3)
By: Frank Vasquez, Chris Simmonds

Overview of this book

If you’re looking for a book that will demystify embedded Linux, then you’ve come to the right place. Mastering Embedded Linux Programming is a fully comprehensive guide that can serve both as means to learn new things or as a handy reference. The first few chapters of this book will break down the fundamental elements that underpin all embedded Linux projects: the toolchain, the bootloader, the kernel, and the root filesystem. After that, you will learn how to create each of these elements from scratch and automate the process using Buildroot and the Yocto Project. As you progress, the book will show you how to implement an effective storage strategy for flash memory chips and install updates to a device remotely once it’s deployed. You’ll also learn about the key aspects of writing code for embedded Linux, such as how to access hardware from apps, the implications of writing multi-threaded code, and techniques to manage memory in an efficient way. The final chapters demonstrate how to debug your code, whether it resides in apps or in the Linux kernel itself. You’ll also cover the different tracers and profilers that are available for Linux so that you can quickly pinpoint any performance bottlenecks in your system. By the end of this Linux book, you’ll be able to create efficient and secure embedded devices using Linux.
Table of Contents (27 chapters)
1
Section 1: Elements of Embedded Linux
10
Section 2: System Architecture and Design Decisions
18
Section 3: Writing Embedded Applications
22
Section 4: Debugging and Optimizing Performance

Chapter 7: Developing with Yocto

Bringing up Linux on unsupported hardware can be a painstaking process. Luckily, Yocto provides Board Support Packages (BSPs) to bootstrap embedded Linux development on popular single-board computers such as the BeagleBone Black and Raspberry Pi 4. Building on top of an existing BSP layer lets us quickly take advantage of complex built-in peripherals such as Bluetooth and Wi-Fi. In this chapter, we will create a custom application layer to do just that.

Next, we will look at the development workflow that's enabled by Yocto's extensible SDK. Modifying software running on a target device usually means swapping out the SD card. Since rebuilding and redeploying full images is too time-consuming, I will show you how to use devtool to quickly automate and iterate over your work. While doing so, you will learn how to save your work in your own layers so that it does not get lost.

Yocto not only builds Linux images but entire Linux distributions...