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

Provisioning a remote package server

Setting up an HTTP remote package server and pointing your target clients at it is easier than you might think. The client-side server address configuration varies between package managers. We will configure opkg manually on the Raspberry Pi 4.

Let's start with the package server:

  1. First, navigate one level above the directory where you cloned Yocto.
  2. Next, set up your BitBake work environment:
    $ source poky/oe-init-build-env build-rpi

    This sets a bunch of environment variables and puts you back in the
    build-rpi directory.

  3. Build the curl package:
    $ bitbake curl
  4. Populate the package index:
    $ bitbake package-index
  5. Locate the package installer files:
    $ ls tmp-glibc/deploy/ipk

    There should be three directories named aarch64, all, and raspberrypi4_64 in ipk. The architecture directory is aarch64, while the machine directory is raspberrypi4_64. The names of these two directories will vary, depending on how your image has been configured...