Developing With Embedded Linux
Standard Level - 4 days
The course provides an overview of what an embedded Linux system is compromised of and provides practical information about how to work with each of the components. At each stage there is a strong focus on what tools are available in Linux to understand and debug problems. How to configure an embedded Linux system is considered in detail, looking at the changes that need to be made as a project moves from a development phase into a product. The aim is to equip attendees with the skills they need to develop and maintain their embedded Linux based products in an efficient and effective way.
Workshops comprise approximately 50% of class time, and are based around carefully designed exercises to reinforce and challenge the extent of learning.
The course mainly uses Linux open source tools with a discussion of some of the available commercial solutions where appropriate.
Course Overview Video
This course is designed for anyone wishing to get started quickly on working with Linux for embedded systems.
What will you learn?
- 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.
HardwareThis is a hands-on training course and labs are conducted on a real target board.
For scheduled public courses the actual target board provided during the course may vary dependent on the location.
Target boards currently deployed include an NXP® i.MX6SX board featuring Arm® Cortex®-A9 and Cortex-M4 cores and boards based on the Xilinx® Zynq®-7000SoC, featuring a dual Arm Cortex-A9 processor:
Please contact the Doulos team to discuss your specific project and hardware requirements.
Course materialsDoulos 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.
Structure and Content
- Course Objectives
- Linux Background
- Open-Source Software
- Linux Distributions
- Development platforms
- Version control
Anatomy of an Embedded Linux System
- Linux kernel
- Host to target communications
- 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
- Configuring and building the kernel
- Creating a kernel module
Debugging the Linux Kernel
- Kernel logs
- Using kernel logs
- Using KGDB to debug a kernel module
- Compiling on the target
- Static and shared libraries
- Using portable build systems (e.g. Autotools)
- Creating static and shared libraries
- Configuring and compiling an Autotools application
- Compiling for debugging
- Target debugging
- Cross debugging
- Other user space tools
- Debugging user space seg faults
- Target debugging
- Cross-debugging a seg fault
- Finding memory leaks with Valgrind
- Generating and using core-dumps
- How a Linux application can be structured
- Managing processes and threads
- Inter-process communications
- Interfacing with the kernel
- Simple IPC
- Threads and processes
- Filesystem contents
- Filesystem types and locations
- RAM filesystems
- Block-based filesystems
- Flash filesystems (JFFS2, UBIFS)
- Configuring and compiling BusyBox
- Creating an initramfs
- Writing a UBIFS into flash
Configuring the Bootloader
- The bootloader
- Bootloader choices
- Working with U-Boot
- Porting U-Boot to a new board
- Configuring the target root filesystem location
- Flashing a kernel image in U-Boot
Trace & Profile
- Linux trace technology
- Other Tools
- Use case examples
scpbehaviour with trace & profile tools
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