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ac6 >> ac6-training >> Systèmes d'Exploitation >> Linux >> Embedded Linux with Ac6 System Workbench Télécharger le catalogue Télécharger la page Ecrivez nous Version imprimable

D1S Embedded Linux with Ac6 System Workbench

Implementing Linux on Embedded Systems

Implementing Linux on Embedded Systems
formateur
Objectives
  • Understanding the architecture of the Linux system
  • Learn how to install Linux on your hardware and create a BSP
  • Explore the Linux system architecture
  • Booting Linux
  • Initializing the system
  • Install existing packages on the target
  • Learn how to install Linux on flash chips
Labs are conducted on quad Cortex/A9-based "Sabre" boards from NXP.
Course environment
  • Printed course material (in English)
  • One Linux PC for two trainees.
  • One target platform (i.MX6 Sabre) for two trainees
A version of “Ac6 System Workbench for Linux – Basic Edition” is provided free of charge to each trainee
Prerequisite

First Day
Introduction to Linux
  • Linux history and Version management
  • Linux system architecture
    • Processes and MMU
    • System calls
    • Shared libraries
  • Linux components
    • Toolchain
    • Bootloader
    • Kernel
    • Root file system
  • Linux distributions
  • Linux packages
  • The various licenses used by Linux (GPL, LGPL, etc)
Linux tools for embedded systems
  • Boot loaders (UBoot, Redboot, barebox)
  • Optimized libraries (eglibc, uClibc)
  • Toolchains
  • Embedded GUIs
  • Busybox
  • Embedded distributions
    • Commercial
    • Standard
    • Tools for building custom distributions
Introduction to System Workbench
  • Overview
    • Eclipse
    • Kernel and modules
    • Platforms and Root file-systems
  • The build system architecture
    • Building individual packages
    • Building platforms
    • Building Root file-systems
Exercise :  Building a root file system a pre-defined platform template
Developing applications with System Workbench
  • Creating a Linux program
  • Creating a library
    • Static library
    • Shared library
  • Debugging on the target
    • Using an SSH connection
    • Debugging shared libraries
Exercise :  Create a small program, with a custom shared library, and debug it on the target
Using U-Boot
  • Introduction to U-Boot
  • Booting the board through U-Boot
    • Booting from NOR
    • Booting from NAND
    • Booting from eMMC
  • U-Boot environment variables
    • User-defined variables
    • Predefined variables
    • Variables substitution
  • The U-Boot minimal shell
    • Writing scripts in variables
    • Executing scripts
    • Using variables in scripts: the set-script pattern
  • U-Boot main commands
    • Booting an OS
    • Accessing flash chips
    • Accessing file systems (NFS, FAT, EXTx, JFFS2…)
  • The full U-Boot shell
    • Script structure
    • Control flow instructions (if, for…)
  • Booting Linux
    • Linux kernel parameters
    • The Linux startup sequence
Exercise :  Writing a script to configure the network and pass this configuration to the Linux kernel
Exercise :  Booting the board on NFS, using pre-existing images
Exercise :  Writing scripts to choose between boot from flash or from the network
Second Day
Building U-Boot
  • Building and installing U-Boot with its native build system
  • Building U-boot with System Workbench
Exercise :  Configuring and building u-boot with its native build system
Exercise :  Building u-boot from System Workbench
Building the kernel
  • The Linux build system
    • Downloading stable source code
  • Getting a tarball
  • Using GIT
    • Configuring the kernel
    • Compiling the kernel and its modules
  • Modules delivered in-tree
  • Out-of-tree modules
    • Installing the kernel and the modules
Exercise :  Configuring and compiling a target kernel for the target board with the kernel build system
  • Kernel projects
    • Creating a kernel project
    • Selecting the architecture and configuration
    • Customizing the configuration
    • Compiling the kernel
Exercise :  Configure and compile the kernel in the platform
  • Module projects
    • Creating a module project
    • Linking it to a kernel project
    • Creating and building modules
Exercise :  Add and configure an external module
Exercise :  Exercise: Configuring and compiling a target kernel for the target board with System Workbench
Building packages
  • Packages
    • Tools to build packages (gcc, Makefile, pkg-config…)
    • Autotools
    • Cross-compiling a package with autotools
  • The all-in-one applications
    • Busybox, the basic utilities
    • Dropbear: encrypted communications (ssh)
  • Automatically starting a program at boot
    • Initialization systems (busybox init, system V init)
Exercise :  Cross-compiling an autotools-based package
Creating a Linux Platform
  • Creating a platform project
    • Importing a pre-configured platform
    • Creating a platform from scratch
  • Configuring the platform
    • Source and installation directories
    • Link to a target Rootfs
    • Build configurations
Exercise :  Create and configure a minimum platform from scratch, using library packages
  • Populating the build environment
    • Import packages in the build environment
    • Build individual packages
    • Build the whole platform
Exercise :  Build the platform, manually building some packages
  • Adding packages to a platform
    • From a library
    • From an existing Eclipse project
Exercise :  Add the previously developed application to the platform
  • Creating a new package
    • Specifying the source
    • Patching the official sources
    • Adding package-specific resources
    • Adding package configuration directives
Exercise :  Add a new open-source package to the platform
Third Day
Embedded file systems
  • Storage interfaces
    • Block devices
    • MTD
  • Flash memories and Linux MTDs
    • NOR flashes
    • NAND flashes
    • ONENAND flashes
  • The various flash file system formats
    • JFFS2, YAFFS2, UBIFS
  • Read-only file system
    • CRAMFS, SQUASHFS
  • Standard Linux file systems
    • Ext2/3/4, FAT, NFS
    • Ramdisks and initrd
    • Creating an initramfs
    • Booting through an initramfs
  • Choosing the right file system formats
  • Flashing the file system
Creating a root file system
  • Manually building your root file system
    • Device nodes, programs and libraries
    • Configuration files (network, udev, …)
    • Installing modules
    • Looking for and installing the needed libraries
    • Testing file system consistency and completeness
  • Package management
    • ipkg
Exercise :  Manually creating a minimal root file system using busybox and dropbear
  • Creating a rootfs project
    • Creating the rootfs structure
    • Add files to the base structure
  • Edit standard configuration files
    • File systems
    • Initialization
    • Starting applications