Embedded System

1
??? ????? ? ??

• Chapter 1.
• Embedded System

2
Contents

• ?? ?? ? ??
• Embedded System
• Embedded OS
• Embedded Linux
• Embedded System ?? ??

3
Introduction

• ?? ??
• Embedded Linux
• Target Board HBE-EMPOS-II
• CPU Intel PXA 255 (Xscale)
• Development Environment Tool Chains, JTAG
• ?? ??
• Embedded Linux ??? ??, ?? ? ??? ?? ??
• PXA 255 ???? ???? OS? ???? ??? ???? ??? ??? ??
  ???? ??
• Embedded system programming ?? ??
• C ??? ???? ???? ????? ??? ?? ?? ??? ?? ?? ???? ??
  ??
• Project
• ???? ??? (2? 1?) ??
• ???? ?? ???
• ???? ??

4
Embedded System

• Embedded System
• ?? ??? ?? ??? ???? ?? ????? ?????? ??? ?? ?? ???
• ASIC ??? ?? ???????? (microprocessor)? ????? ???
  ???
• H/W Microprocessor, Controller, Memory, Sensor
• S/W Operating System, Device Driver, Application
  Program
• Embedded System ??
• Application-specific functionality
• ?? ??? ???? ??
• Small size Light weight
• Real-time Operation/Dependable
• Extreme Cost Sensitivity
• Limited memory, lower power for microprocessor

5
Embedded OS

• Real Time OS
• VxWorks HONDA? Asimo? ??
• pSOS ???? ???? ??, VxWorks? ??
• VRTX, uC/OSII
• ?? Embedded OS
• Windows CE
• Intel x86 ?? ??, MS? ?? ?? ??, Pocket PC
• 3Com Palm
• Motorola ???? ? ??? ????, Sony Cleo
• Symbian
• ??? ??? ??? ???? ??? ????
• Embedded Linux

6
Embedded Linux

• ? ??? ????? ???? ???? ?? ???? ?????? ??
• ??
• Embedded Linux Source? ??? OS, Applications
• ???
• ????? ??? ??? ???? upgrade
• ??? ?? ??? ??
• Cross-compiler, Debugger, GUI?
• ??? CPU? ????
• ?? ??? ????? ?? JTAG, PCMCIA, LCD, I/O, IDE

7
Embedded System ?? ??
???? ????? ?? (application)
???? ??
8
Host PC ?? ????

• Cross Compiler Tool Chain
• Host PC? Target Board?? ???? ????? ?? ?? Target
  Board?? ??? ? ??? ????? ???
• JTAG
• Host PC?? Target Board? Flash ROM? ????
  (Bootloader)? ?????? ???? (fusing)
• Terminal Emulation Serial port
• Target Board?? ???? ??? Host PC?? ? ? ??? ???? ?
  ? ?? ?? ?? ????
• bootp, tftp, nfs service

9
Target Board ?? ????

• Bootloader
• Target Board booting? ????? ?????, ??? ARM? ?? ?
  ????? ??? ???? ????
• Linux Kernel
• Target Board? System ??? ??? ??? ??? Target Board
  ??? ???? ??? ???? ?????
• File System
• ?? ???? ??? ???? ?? ???? ???? ??? ?? ???
  operation ?? ??? ????? ??
• Device Driver
• ?? ????? ???? ?? ????
• Application
• GPS,tcpdump, MediaPlayer?

10
HBE-EMPOS II