Linux Kernel Development I - "Hello, World!" char driver

So here is my first post about Linux kernel module development!

I published this article in my old blog before. We will write a "Hello, world!" char device driver. I also released the code long time ago [source].

Here is the reason why I start with this article: When you google printk you get so many results, tutorials, stackoverflow.com questions, .doc files, .pdf files, stuff about formatting and console log levels etc. But when you search for how to write a simple working driver (I mean a driver which does something ''besides'' printing text to dmesg) you get only a handful of helpful results, some of which are fairly out-dated.

What I want to give you is a working char device driver with minimal kernel bureaucracy. You will still need to read a good book on drivers and write lots of code later. But you will get your own working little kernel code. As they say, "Seeing is believing" and I think there is a good number of people who put off just because they don't see their code do something meaningful (or study a working module/driver source but can't see any piece code which makes sense :). I aim to help people who are curious about kernel development but lose interest thinking it is too much stuff to learn or too much code to write even for the simplest working driver. So if you are stuck while reading a book or taking a course on developing device drivers for Linux you probably came to the right place.

Preparing a test VM - Extras

Hi,

In this extra part I want to talk a little bit about accessing the Internet from within the VM and installing packages in Gentoo. I will also talk about practically uploading your files into the VM.