August 2008
Intermediate to advanced
464 pages
16h 3m
English
book
Building Embedded Linux Systems, 2nd Edition
by Philippe Gerum, Karim Yaghmour, Jon Masters, Gilad Ben-Yossef
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Chapter 6. Root Filesystem Content
One of the last operations conducted by the Linux kernel during system startup is mounting the root filesystem. The Linux kernel itself doesn’t dictate any filesystem structure, but user space applications do expect to find files with specific names in specific directory structures. Therefore, it is useful to follow the de facto standards that have emerged in Linux systems.
In this chapter, we will start by discussing the basic root filesystem structure. Then, we will explain how and where to install the system libraries, the kernel modules, kernel images, device nodes, main system applications, and custom applications. Finally, we will discuss how to configure the system initialization scripts.
At the end of this chapter, you will have a fully functional root filesystem for your target. In the following chapters, we will talk about how you can place this root filesystem on an actual filesystem type on a storage device for use in your target.
Basic Root Filesystem Structure
The “official” rules to build a root filesystem are contained in the Filesystem Hierarchy Standard (FHS) introduced in Chapter 1. The document is less than 30 pages long and is fairly easy to read. If you are looking for answers or clarifications regarding how to build a root filesystem, the FHS, along with related standards documentation from the Linux Foundation, are probably the best places to start.
Each of the top-level directories in the root filesystem has ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.