【CHICHI ETUTOR@ARM】Introduction to EMbedded LINUX SYSTEM

1. What is "Embedded System"
    

      “Embedded System" is any computer system or computing device that performs a dedicated function or is designed for use with a specific embedded software application.
Embedded systems may use a ROM-based operating system. But an embedded system is not usable as a commercially viable substitute for general purpose computers or devices


2.What is embedded "linux" system
      Embedded Linux is the use of a Linux operating system in embedded computer systems such as mobile phones, personal digital assistants, media players, set-top boxes , networking equipment, machine control, industrial automation, navigation equipment and medical instruments

3. Embedded System Design Flow

4. Software/Hardware Architecture in embedded linux system

5. Embedded Processors

    ARM:

            *computer (RISC) instruction set architecture (ISA)

            *ARM7,ARM9,Xscale,ARM11,Cortex

            *allwinner,S3C6410, OMAP3530, Tegra3, S5PV210,  Snapdragon,Marvell ARMADA XP,

    MIPS:

                     *computer (RISC) instruction set architecture (ISA)

             *Broadcom MIPS XLP208/XLP204

6.Embedded System Software

   Bootloader

     hardware initialization

     Loading a OS/Kernel

        e.g : uboot

Operating System

      Open Source OS

         e.g. : linux kernel,uClinux

Root file system

    contains the application programs, system  libraries , and utilities that make up a  system

         e.g. : Root file system in stroage                           JFFS2,YAFFS

         e.g. : Root file system in stroage                             RAMDISK

        e.g : Root file system in mounted through Network

                  NFS

 

7. Embedded Linux Components

   Kernel

    Manages tasks (Scheduler)

    Memory management

Drivers

   Manage hardware resources

Root File System

Libraries

    *C Library

    *Run-time Library

Applications(including GUI)

   *Shell : Command Line Interface

    *GUI : KDE,GNOME

Scripts

User data/Application/Utility

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