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Embedded Linux Kernel Internals and Device Drivers

5-day class

The course content could be tailored to better suit your needs and objectives. If time permits consulting during the training can be included. Please click the public tab to see the public sessions.

Private online
Onsite at your premises
We'll never share your email with anyone else.
Pick Quarter Quarter Status Access Delivery Location Language Timezone Book Until
1st quarter 2024 private remote virtual German/English (to be defined) UTC+2 (to be defined) Apr 01, 2024
2nd quarter 2024 private remote virtual German/English (to be defined) UTC+2 (to be defined) Jul 01, 2024
3rd quarter 2024 private remote virtual German/English (to be defined) UTC+2 (to be defined) Oct 01, 2024
4th quarter 2024 private remote virtual German/English (to be defined) UTC+2 (to be defined) Jan 01, 2025

Content as described below. Starting from three attendees from the same company please check our private sessions.

Public online
Public workshop in classroom
We'll never share your email with anyone else.
Pick Date Date Status Access Delivery Location Language Timezone Book Until
Nov 04, 2024 public remote virtual German/English (to be defined) UTC+2 Sep 06, 2024

This course shows kernel internals and Linux device drivers and where to find more advanced topics.

Course Objectives

We’ll cover the basics needed to write upstream Linux device drivers, which includes also some kernel internals. Instructions, theory, and practical exercises enable you to interact with the community right from the start. After successfully completing this course you should know where to find what’s needed to write and maintain your own Linux device drivers.

Description

In this five-day course, the concepts of Linux kernel internals and device driver development are illustrated through hands-on exercises combined with instructions. The practical exercises are carried out with free and open-source software such as the Yocto Project® software development kit (SDK) on a target board (e.g. i.mx6). The hardware can be purchased and will be shipped to you on request. This enables you to work with the course material at your premises even after the workshop. The training is structured in such a way that you can quickly familiarize yourself with the subject. We describe the processes, concepts, and commands necessary to write Linux device drivers through a combination of theory and hands-on exercises. Learn from an expert trainer and take home the knowledge and ability to effectively use it in your own embedded development project.

Prerequisites

  • Basic familiarity with using a Linux system (e.g. Ubuntu) as an end-user in user space
  • Basic familiarity with a command-line shell
  • Basic knowledge of Linux userspace and application development
  • Intermediate C programming knowledge
  • You should have attended ”Embedded Linux – From System Architecture to Real-Time (5 days)” or ”Introduction to Embedded Linux in Theory and Practice – a Crash Course (3 days)” (strongly recommended!)
  • …except if you are already familiar with the material presented in those courses.
  • In order to follow this course, you should have experience with embedded Linux (how to build the kernel, userspace, root filesystem, and use the tools).
  • The sessions mentioned above can be delivered on-site and online. Feel free to ask for dates and pricing here.

Course Roadmap

Who should attend?

People with interest in or who are tasked with the development or evaluation of developing (Embedded) Linux device drivers. The workshop is aimed at managers, software-, development-, system engineers, testers, administrators, engineers, and other parties interested in (Embedded) Linux device drivers.

Course Outline

Day 1

Introduction

  • A quick history of Linux | licensing | kernel versioning | release cycle | kernel trees | mainline | kernel-space compared to user-space | difference between mechanism and policy | kernel driver alternatives | Real-Time-Operating-Systems (RTOS) in contrast to Linux

Memory Management

  • virtual memory versus physical memory | memory allocation in kernel | pages | zones | API | slab

Kernel Patch

  • patch life cycle | git | kernel source code | create patch | check patch | fix patch | ship the patch | audited source code (git)
Day 2

Kernel Modules

  • get kernel sources | configure kernel | build kernel | install kernel | kernel module (statically linked | loaded at run-time) | __init/__exit | Licensing | tainted module/kernel | EXPORT_SYMBOL | out of tree.ko makefile | module-init-tools | put the module in the kernel tree | Kconfig | parameter passing | sparse

Character Drivers

  • architecture | user/kernel interface | I/O subsystem | virtual file system (VFS) | sysfs (devices | bus | drivers | classes) | kobject | ktype | kset | Linux Kernel Driver Model | device files
  • Character Driver
    • Driver initialization | Registration of Character Driver | Driver opening | Driver release | cdev | cdev_add | cdev_del || major/minor numbers | udev | udevmonitor | udevadm
Day 3

Character Driver Functions (advanced)

  • ioctl | unlocked_ioctl | compat_ioctl | user-space API | kernel-space API | process life-cycle | sleeping / blocking | sleeping / waking up | wait queue | thundering herd | poll/select
  • bug | debugging | debugging the kernel | binary search with git | debug support from the kernel | printk | syslogd | klogd | loglevels | Rate limit | debug levels | debug selective subsystems | debugging by querying | debugfs | oops debugging | programmatically asserting an oops | MagicSysRqKey | kgdb/kdb | JTAG (optional)
Day 4

Kernel Profiling/Tracing

  • gcov|lcov|oprofile (deprecated and replaced by perf) |ftrace
    • nop tracer | function tracer | sched_switch tracer (viewer) | function_graph tracer | dynamic tracer
  • perf| LTTng | Kernel Probes
    • Kprobes | JProbes | KretProbes (partially deprecated)

Interrupts

  • interrupts as opposed to polling | interrupt | program sections | reentrancy | events | interrupt handler | shared interrupt handler | interrupt flow | interrupt control

Deferring Work

  • top/bottom halves | Softirqs | Tasklets | Workqueues | Threaded interrupts
Day 5

Concurrency

  • critical region/section | atomic | race condition | synchronization | locking | locking solutions | deadlock | contention | What needs to be locked?
  • atomic operations | spin locks | reader-writer spin locks | semaphore | binary semaphore | mutex | reader-writer semaphore | completion variables | sequential locks | disable Preemption | sequential order, and Hardware/Software barriers

Time

  • HZ | jiffies | big/small delays | kernel timers | high-resolution timers

Hardware I/O

  • I/O Ports | I/O Memory | How to deal with side effects accessing registers?

User-Kernel Communication

  • put(get)_user() | copy_to(from)_user() | Kernel I/O | memory mapping | procfs | sysfs | debugfs | relayfs | netlink | ioctl

Portability

  • word size | opaque data types | signed/unsigned char | data alignment (padding) | Integral Promotion | code reuse | Endianess | system tick | page size | In which order software instructions are executed? | Symmetric Multi Processing (SMP) | Preemption | high memory

Course Brochure (pdf)

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