INTRODUCTION TO LINUX DEVICE DRIVER TRAINING:
LINUX DEVICE DRIVER TRAINING Course is all about how to develop device drivers for linux, how device drivers work with the Linux kernel, how to compile and load drivers, how to debug drivers, as well as other essential topics. LINUX DEVICE DRIVER TRAINING course is designed for software engineers who are new to Linux device drivers. Attendees should have experience with C, be able to perform basic Unix commands, and have some experience with the basic Gnu tools of gcc, gdb, and make.
Embedded Linux Device Driver training helps in understanding of the essentials of Linux device drivers, purpose and functionality of device drivers and how Compiling and linking device drivers does is processed. Register today at the website to learn more and call us directly at the help desk.
Prerequisites of Linux Device Driver Training:
- Familiarity with Basic Linux Kernel
- Understanding of C language.
- Knowledge of how to write kernel program.
- Understanding of basic utilities of Linux operating system e.g insmod, rmmod, dmesg etc.
- Understanding of Linux kernel internals.
- And obviously you should know about your device. Understand its specification. Learn to read and understand datasheet of the device. It will help to write efficient device driver code.
Linux Device Driver Online Training Outline:
- Program Name: Linux Device Driver Training course.
- Duration of Course: 30 Hours (It can also be optimized as per required period).
- Mode of training: Online, Classroom, and corporate training.
- Timings: According to one’s feasibility.
- Batch Type: Regular, weekends and fast track.
- Materials: Yes, we are providing materials for Linux Device Driver Online Course. (We will get the soft copy material)
- Sessions will be conducted through WEBEX, GoToMeeting OR SKYPE.
- Basic Requirements: Good Internet Speed, Headset.
- Trainer Experience: 10+ years.
- Course Fee: please register on our website, so that one of our agents will assist you
Overview of Linux Device Driver online Training:
Linux is basically divided into user space & kernel space. These two components interact through the system call interface – a predefined and mature interface to the Linux kernel for user space applications. The image below gives you a basic understanding.
Differences between Kernel Modules and User Programs:
- Kernel modules have separate address space.A module runs in kernel space. An application runs in user space. System software is protected from user programs. Kernel space and user space have their own memory address spaces.
- Kernel modules have higher execution privilege.Code that runs in kernel space has greater privilege than code that runs in user space.
- Kernel modules do not execute sequentially.A user program typically executes sequentially and performs a single task from beginning to end. A kernel module does not execute sequentially. A kernel module registers itself in order to serve future requests.
- Kernel modules use different header files.Kernel modules require a different set of header files than user programs require.
When user application wants to access hardware information, it access through Linux device drivers.What is the need of Device Driver? Why can’t the user applications access hardware directly? Allowing a user space application to directly access hardware is very dangerous and not secure. So, Linux Kernel restricts the user space applications to directly access the functionality of a particular hardware.
Only one secure way for user application to access hardware is by using Linux device drivers. It provide a programming interface which helps the user applications to access particular functionality of the hardware without knowing the hardware details.
Note that the programming interface here should be built separately from the rest of the Kernel and plugged in as modules at runtime when needed. In this way device drivers provide more security and flexibility.
Points to keep in mind while writing a device driver:
- While writing a driver to a specific device, remember that each driver is different, as a driver writer, you need to understand your specific device well.
- You need to gather all information like datasheets, design documents and schematics of your device from device vendor.
Linux Device Driver Training at Global online Trainings – In Linux, System memory can be divided in to two distinct regions: Kernel space and user space. We all know that every system has certain amount of memory. Coming to the purpose of memory, it grasp programs and data that are at present in use and by this means serve as a high speed medium between the CPU and the much slower storages like hard disk drives. Hope, you understood how system memory, user space and kernel space are related. If you want to learn more about this course, Join us in Global online trainings which provides Linux Device Driver Training by real time experts.
Who can go for this course?
- Students from third and fourth year of BE/B. Tech. courses (Computers, Electronics, Electronics & Telecommunication, Instrumentation, Computer Science, Information Technology)
- Final year students of MCA/BCA/M.Sc-IT/M.Tech
- Working professionals from Embedded Systems and the related domains
- Professionals willing to develop device driver programming skills
Learn Kernel space and User space in Linux Device Driver Training:
Do I have your attention? Kernel space is where the operating system runs and provides services. User space is where user processes run. What is a process? A process is a performance instance of a program. One of the roles of the Kernel is to direct individual user processes within this space and to stop them from interfering with each other.
Note that the device driver runs in kernel space and not in user space. All applications run in user space but not in kernel space. Every device driver programmer should remember these points.
How the interactions happen between Kernel space and User space?
- Linux Device Driver Training at Global online Trainings – To answer this question in short, it happens only through system calls. What are system Calls? System Calls are the requests in Linux, like operating system by an active process for a service provided by the Kernel such as input/output or process creation. In this what exactly we mean by active process? An active process is a process that is at present processing in the CPU. Whereas, the process is the one which is waiting for its next turn in the CPU. All the interactions are managed by the core kernel.
- Application program will reside in user space and driver will reside in kernel space. System calls are the only way for a user space program to access kernel space device drivers. Kernel modules can be classified in to two types. Static modules and Dynamic modules. Are you passionate in doing certifications? We provide Linux Device Driver Training from India at flexible timings.
- What is a static module? Static modules are compiled as a part of the kernel and are available at anytime. These make the kernel larger and has the disadvantage of requiring us to rebuild and reboot the kernel every time when we need certain functionality.
- Static modules SM1 and SM2 are internal part of kernel image. They always reside in the kernel image. Any single alteration to this module will need us to rebuild the whole kernel which put away time and effort.
What is Dynamic Module? Dynamic modules are pieces of code that can be laden and unload into the kernel upon order. They expand the functionality of the kernel without the requirement to reboot the system. After loading the kernel, we can load this modules using insmode and unload using rmmod. Dynamic modules have the advantage that it uses the memory more powerfully than the statically linked drivers. DM1 and DM2 are the dynamic modules which are not part of kernel image but still can be loaded into kernel depending on our requirement. If you want to learn more about this course, Join in Global online trainings for best Linux Device Driver Training at an affordable cost.
What is the Role of Linux Kernel in Linux Device Driver Training?
The different kernel roles fall under a system call interface layer acting as a interface between various kernel components and user space applications. System call interface layer is exposed to user application layer. User applications uses these system call interface as a means to access particular hardware functionality through device drivers in Linux Device Driver Training .
In Linux Device Driver Training , As a part of process management, Kernel is in charge of creating and destroying processes and handling input and output operations. Communication among different processes happens through various mechanisms called Inter process communication mechanisms. We will discuss about various inter processes mechanisms like signals, pipes, shared memory in upcoming parts.
The scheduler which manages how processes share the CPU, is part of process management. More generally, the kernel’s process management activity runs several processes on top of a single CPU or on multiple CPU’s in Embedded Linux Training .
Memory management looks at how the kernel manages physical memory. Memory is a main supply, and the policy used to contract with it is a critical one for system performance. The kernel build’s up a virtual address space for any and all processes on top of the limited available resources.
Almost the whole thing in Linux can be take care as a file. Linux is heavily based on the file system concept. In Linux Developer Training the kernel builds a prearranged file system on top of formless hardware and the resulting file concept is a lot used all the way through the whole system.
Loading Kernel Modules:
What is Insmod? And What does it do? Insmod is a kernel utility that installs loadable kernel modules into kernel and it links any unresolved symbols in the module to the symbol table of the kernel. Insmod accepts a number of command line options. It can assign a value to parameters in a module before linking it to the current kernel. In Linux Device Driver Training , Note that if a module is correctly designed it can be configured at load time by passing arguments to insmod.
Types of the Linux devices:
In the traditional classification, there are three kinds of device:
- Character device
- Block device
- Network device
In Linux everything is a file. I mean Linux treat everything as a File even hardware.
A char file is a hardware file which reads/write data in character by character fashion. Some classic examples are keyboard, mouse, and serial printer. If a user use a char file for writing data no other user can use same char file to write data which blocks access to other user. Character files uses synchronize Technic to write data. Of you observe char files are used for communication purpose and they cannot be mounted.
A block file is a hardware file which read/write data in blocks instead of character by character. This type of files are very much useful when we want to write/read data in bulk fashion. All our disks such are HDD, USB and CDROMs are block devices. This is the reason when we are formatting we consider block size. The write of data is done in asynchronous fashion and it is CPU intensive activity. These devices files are used to store data on real hardware and can be mounted so that we can access the data we written.
A network device is, so far as Linux’s network subsystem is concerned, an entity that sends and receives packets of data. This is normally a physical device such as an ethernet card. Some network devices though are software only such as the loopback device which is used for sending data to yourself.
Conclusion of Embedded Linux Device Driver training :
What’s the bottom line? Linux also supports multiple file system types that are different ways of organizing data on the physical medium. For example, disks may be formatted with the Linux standard ext3 file system or the commonly used FAT file system or several others. The various parts of the kernel interact with the memory management subsystem all the way through a set of function calls, ranging from the simple malloc/free pair to much more complex functionalities. There are lots of opportunities in the market for Embedded Linux Device Driver training. So what are you waiting for? Come be part of Linux and utilize the services it provides. Join in Global online trainings for best Linux Device Driver Training by real time experts. Hurry Up!! For more information do contact our help desk.