Developing for Embedded Linux
Length: 5 daysview dates and locations
This course is delivered in co-operation with Doulos' training partner Feabhas, who specialise in training courses for real-time embedded developers.
Linux is often used as an embedded operating system, and yet it is still regarded as something of a black art by many. This course aims to remove the mystique by showing exactly how to deploy Linux on a typical embedded target board through a combination of theory and practice.
Starting a board with no operating system, delegates will go through a simulated product cycle during which they will build and boot a Linux kernel, build a root file system, write a device driver and a multi-threaded application. Finally, they will review the performance of the resulting system and consider what changes could be made to improve it's real-time performance.
A 5-day course showing how to implement Linux on a typical development board (Arm core).
- Describe the four essential components of an embedded project: toolchain, kernel, bootloader and root file system
- Show how to control hardware from a device driver (in outline, see EL-504 for a more in-depth treatment)
- Give an overview of application development, profiling and debugging
- Show how to configure NOR and NAND flash memory for robust code and data storage
- Look at the issues of real-time and Linux
Delegates will learn
- How to configure and build a customised Linux 2.6 kernel
- How to construct a compact root file system from scratch
- How to develop and debug code for the target board, using the Eclipse IDE
- How to write single and multi-threaded programs using POSIX functions
- Which aspects of the system affect real-time performance and how to reduce scheduling latencies
Who Should Attend
Software engineers who are developing applications for embedded or real-time Linux. Engineers wishing to assess the suitability of Linux for their next application.
- Good 'C' programming skills
- General knowledge of an RTOS or embedded operating systems
- Experience of using Linux or a version of Unix will be useful, but not essential
- Student workbook.
Developing Linux Device Drivers.
The course presents embedded and real-time concepts applied to Linux using an Arm9 development board as the target (a Digi ConnectCore Wi-9C). The host development system is a standard PC running Linux. We use the target as an example of a simple embedded system which can control hardware via a simple digital I/O interface. Lab sessions follow a logical sequence, and result in "the world 's first Linux-powered web-controlled washing machine."
Linux in an embedded context • The 4 basic elements: toolchain, bootloader, kernel, root file system
The Linux Kernel
Virtual memory • configuration and cross-compiling
The Linux boot sequence • boot-loaders: U-boot • loading images using TFTP
The root file-system
Creating a minimal root file-system using Busybox • The C library: glibc vs uClibc. • Creating a RAM disk image
Static and dynamic IP addresses • mounting the root file system over NFS
How to write a simple driver to access GPIO pins • kernel modules
Logging using , syslogd • remote debugging using Eclipse and gdbserver.
Processes: fork and exit, scheduling • signals and signal handlers • time and timers • pipes, message queues, semaphores, shared memory
Threads vs processes • synchronising threads using mutexes and condition variables.
the Linux Memory Technology Devices Layer
File-system suitable for embedded applications • Study of cramfs, tmpfs, jffs2 and yaffs
Real time Linux
Typical Interrupt latency. kernel pre-emption modes • the real-time patch • practical considerations
Profiling using using gprof and Oprofile
Real time sub-kernels
Introduction to writing hard real-time tasks using RTAI
Looking for team-based training, or other locations?
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