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Mastering Embedded Linux Development

Mastering Embedded Linux Development

By : Frank Vasquez, Mr. Chris Simmonds
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Mastering Embedded Linux Development

Mastering Embedded Linux Development

By: Frank Vasquez, Mr. Chris Simmonds

Overview of this book

Mastering Embedded Linux Development' is designed to be both a learning resource and a reference for your embedded Linux projects. The book starts by breaking down the fundamental elements that underpin all embedded Linux projects: the toolchain, the bootloader, the kernel, and the root filesystem. First, you will download and install a pre-built toolchain. After that, you will cross-compile each of the remaining three elements from scratch and learn to automate the process using Buildroot and the Yocto Project. The book progresses with coverage of over-the-air software updates and rapid prototyping with add-on boards. Two new chapters tackle modern development practices including Python packaging and deploying containerized applications. These are followed by a chapter on writing multithreaded code and another on techniques to manage memory in an efficient way. The final chapters demonstrate how to debug your code, whether it resides in user space or in the Linux kernel itself. In addition to GDB, the book also covers 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 book, you will be able to create efficient and secure embedded devices with Linux that will delight your users.
Table of Contents (28 chapters)
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1
Part 1: Elements of Embedded Linux
7
Part 2: Building Embedded Linux Images
11
Part 3: System Architecture and Design Decisions
18
Part 4: Developing Applications
23
Part 5: Debugging and Optimizing Performance

Summary

Every Linux device needs an init program of some kind. If you are designing a system that only needs to launch a small number of daemons at startup, then BusyBox init is sufficient. BusyBox init is also usually a good choice if you are using Buildroot as your build system.

On the other hand, if you have a system with complex dependencies between services at boot time or runtime, then systemd is the best choice. Even without such complexity, systemd has some useful features like watchdogs, remote logging, and so on. If you have the storage space, you should seriously consider systemd.

Meanwhile, System V init lives on. It is well understood and there are already init scripts for every component that is important to us. System V remains the default init for The Yocto Project reference distribution (Poky). In terms of boot time, systemd is faster for similar workloads. However, if you are looking for the fastest boot, neither beats simple BusyBox init with minimal boot...

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