Wednesday 16 April 2014

Developing & Delivering KnowHow

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Developing for Embedded Linux

Length: 5 days

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This course is delivered in co-operation with Doulos' training partner Feabhas, who specialise in training courses for real-time embedded developers.

Course Description

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.

Overview

A 5-day course showing how to implement Linux on a typical development board (ARM core).

Course Objectives

  • 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.

Pre-Requisites

  • 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

Course Materials

  • Student workbook.

Related courses

Developing Linux Device Drivers.

Course Workshop

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'

Course Outline

Introduction

Linux in an embedded context • The 4 basic elements: toolchain, bootloader, kernel, root file system

The Linux Kernel

Virtual memory • configuration and cross-compiling

Booting Linux

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

Network configuration

Static and dynamic IP addresses • mounting the root file system over NFS

Device drivers

How to write a simple driver to access GPIO pins • kernel modules

Debugging

Logging using , syslogd • remote debugging using Eclipse and gdbserver.

POSIX programming

Processes: fork and exit, scheduling • signals and signal handlers • time and timers • pipes, message queues, semaphores, shared memory

POSIX Threads

Threads vs processes • synchronising threads using mutexes and condition variables.

Flash memory

the Linux Memory Technology Devices Layer

File systems

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

Profiling using using gprof and Oprofile

Real time sub-kernels

Introduction to writing hard real-time tasks using RTAI

This course is available now for team-based training at or near to your location. To find out more:

Complete an on-line form and a Doulos representative will get back to you »
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