MrTechpathi Tutorials

In this part , we are going to discuss about 1. Loading Kernel modules 2. Listing  kernel modules 3. Unloading kernel modules Before going ahead with these topics, I strongly recommend you to watch my earlier videos on Linux Device Driver Part 1 to 5. Fine, lets start with our first topic 1. Loading Kernel modules  In earlier session " Linux Device Drivers Part-5 ", we learnt how to build a sample helloworld Linux Kernel module. In this session we will see how to load that sample module into the kernel. We have two kernel utilities which does the trick of loading modules into the kernel. We have two utilities to perform this task 1. insmod 2. modprobe In following slides we will discuss about these utilities, their syntax and usage So,What is insmod and what does it do ? Insmod is a kernel utility that installs loadable Kernel modules into kernel.         It actually loads the module code and data into the kernel land, it links...

In this part, we will discuss about 5 topics Linux Device Driver Example References Setting up Environment for compiling Kernel modules.  Implementing Helloworld Kernel module and Macros used in it. Creating Makefile to compile Helloworld Kernel module Compilation and Kernel object generation of Helloworld Kernel module 1. Linux Device Driver Example references Before proceeding further, make sure you have watched my earlier videos  on "Linux Device drivers"  Part 1 to Part 4. As mentioned in my earlier videos, most of the concepts  discussed in these sessions are  derived from famous O'Rielly Linux Device Drivers  3rd edition. To demonstrate Kernel programming concepts, I will be using the O'Reilly  sample programs which are available on below site to download. http://examples.oreilly.com/linuxdrive3 Download these files and save it to your harddrive. Compiling, loading and modifying these examples are good way to im...

In this sesssion, we will discuss about Linux Kernel Modules Base Kernel, User Space and Kernel Space Types of Linux Kernel Modules, Which module type to choose while Kernel Programming ? Location of Linux Kernel Modules in a linux PC. What exactly is a module in Linux ? Its a piece of code that can be added to the Base Kernel. We will be discussing about Base kernel in coming slides. If you are planning to add some code to kernel, then it means you are adding a module to Linux Kernel.We can't just add code to Linux without any purpose.  We add code to make a device (like printer,bluetooth dongle etc) to work.We call this piece of code as device drivers in Windows. Assuming many are familiar with Windows, we can draw one conclusion.As we have device drivers in Windows Operating system, we have modules in Linux Operating system.In short, Devices Drivers are called modules in Linux Operating system. Both terms can be used interchangeably. Before knowing about Modu...

In previous session, we learnt about a Windows 7 application " Oracle VM VirtualBox ". Please view previous session before proceeding further. Right, once you are done installing with "Oracle VM VirtualBox", you need to first choose the flavour of Linux you are going to install using VirtualBox. I will go ahead and download Centos OS Linux Flavour. To download this iso image, open a separate tab and type this address in address bar. http://centos.linuxfreedom.com/download.html In this website, scroll down and download the first one. Since its 690Meg, it takes time to download. So, wait till the download gets completed. Since, I have already downloaded this image to a particular location, I will go ahead with our tutorial. Start VirtualBox application in windows.Best way is to click here on startup menu and search for virtualbox. Click on it to open. This is very simple interface and easy to install Linux using this application. Using this app...

If you are new to Linux and interested in Linux Boot process, you have reached the correct web-page.This article is for you. Linux is a Open Source Operating System  developed by many programmers around the clock. Its a dynamically evolving Operating system used in various devices like Mobiles, Personal computers, Laptops, tablets etc. If you are using a Linux PC (or a device)  in your daily life, it’s important to know how it boots and what steps are involved in its boot up process. The moment you switch on a Linux device, you may notice various screen displayed during the initial stage of Linux Boot-up. Finally you will end up with a log-in prompt. Are you curious to know what exactly happens between the power-up and the display of Login prompt ?  If you are, then lets see how Linux boots. Linux Boot-up process involves mainly 4 steps: 1.    BIOS 2.    MBR (First Stage Bootloader) 3.    Kernel Loader (Second Sta...

Before starting this tutorial, please take backup of your valuable data. MrTechpathi-Tutorials takes no repsonsibility for any damage or loss of your valuable data. Many wish to install Linux operating system on PC or laptop. First we think about installing as a secondary operating system along with Windows 7. Later, we feel difficult to switch between Linux and Windows because we need to reboot PC for doing this. How to overcome this issue ? Cant we install Linux in Windows 7 ? Yes we can. But we need an application which will allow us to complete this task. There are many such applications available in market. I have chosen Oracle VM VirtualBox Manager. What exactly is a VirtualBox ? VirtualBox is a general-purpose full virtualizer for x86 hardware, targeted at server, desktop and embedded use. Lets see how to install .. First,open your favourite web-brower and copy past this url in address bar of your web-browser. https://www.virtualbox.org/wiki/Downloads ...

As a prerequisite, I strongly recommend you to watch Part-1 and Part-2 of Linux Device Drivers from MrTechpathi Tutorials . In this part we will learn about Role of Linux Kernel. Why this topic is choosen ? This topic is choosen to understand the exact role played by Kernel to provide various services. In this part, I will just brief about kernel roles,     eventually we will be discussing them in detail in upcoming parts. In a Linux system, several concurrent processes attend to different tasks. Each process asks for system resources like computing power, memory, "network connectivity", or some other resource. Who will be serving these resources ?  Yes its the Kernel. Kernel  is the big chunk of executable code in charge of handling all these requests. Although distinction between the different kernel tasks isn't always clearly marked, the kernel's role can be split into the following parts. Process management Memory management File Sy...