Developing with Embedded Linux Online

This course is designed for anyone wishing to get started quickly on working with Linux for embedded systems.

The format of Live ONLINE training from Doulos is focused on delivery of a single 4 hour intensive session per day. This includes live tuition and class interaction with the Doulos subject matter expert during the full scope of each session. 

Labs are incorporated within the 4 hour sessions with the Doulos lab platform providing individual (private) tutor support at all times for each delegate. On occasion, labs may require time outside of the 4 hour session to complete. Additional lab material is available in some subjects for individuals to reinforce their understanding of the course content. 

• An understanding of the structure of an embedded Linux system and how to work with the component parts
• Practical information about developing, analysing and debugging kernel and user space applications using a wide range of freely available Linux tools
• How to configure embedded Linux on the target, including the filesystem and the booting process

• Completion of Linux Fundamentals training or equivalent basic knowledge of using Linux as a host operating system
• Experience of working with embedded systems (e.g. using RTOS or bare machine)
• Some familiarity with C programming is useful

Doulos course materials are renowned for being the most comprehensive and user friendly available. Their unique style, content and coverage has made them sought after resources in their own right. The materials include fully indexed class notes creating a complete reference manual.

Introduction

• Course Objectives
• Linux Background
• Open-Source Software
• Licensing
• Embedded Linux Distributions
• Development platforms
• Host to target communications
• Console command and version control
• Exercises:
  • Booting a standard image
  • Establishing target communications
  • Exploring the target filesystem          

 

Working with the Linux Kernel

• Scheduling, real-time and memory
• Kernel configuration
• Building and booting the kernel
• Board support
• Kernel modules
• Exercises:
  • Configuring and building the kernel
  • Creating a kernel module    

 

Debugging the Linux Kernel

• Kernel logs & printk
• JTAG
• KGDB/KDB
• Exercises:
  • Using kernel logs
  • Using KGDB/KDB to debug a kernel module 

 

Building Applications

• Compiling on the target
• Cross-compiling
• Static and shared libraries
• Using a portable build system (e.g.  Autotools)
• Exercises:
  • Cross-compiling
  • Creating static and shared libraries
  • Configuring and compiling an Autotools application

 

Debugging Applications

• Compiling for debugging
• Target debugging
• Cross debugging
• Other user space tools
• Debugging user space seg faults
• Exercises:
  • Target debugging
  • Cross-debugging a seg fault
  • Generating and using core dumps   

 

Linux Applications

• How a Linux application can be structured
• Managing processes and threads
• Inter-process communications
• Interfacing with the kernel
• Exercises:
  • Simple IPC
  • Threads and processes

 

Configuring Filesystems

• Filesystem contents
• Init programs
• BusyBox
• Device management
• Exercises:
  • Adding a daemon to init
  • Configuring and compiling BusyBox

 

Filesystem Locations

• NFS
• RAM filesystems
• Block-based filesystems
• Flash filesystems (JFFS2, UBIFS)
• Exercises:
  • Creating an initramfs
  • Creating an early user space filesystem
  • Writing a UBIFS into flash

               

Configuring the Bootloader

• The bootloader
• Bootloader choices
• Working with U-Boot
• Porting U-Boot to a new board
• Exercises:
  • Working with the U-Boot shell

 

Trace & Profile

• Linux trace technology
• SysProf
• OProfile
• FTrace
• Perf
• Other Tools
• Use case examples
• Exercises:
  • Investigating scp behaviour with trace & profile tools