?6? FUSING

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?6? FUSING
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??

• 6.1 overview
• 6.2 Bootloader
• 6.3 kernel image
• 6.4 rootfile-system image
• 6.5 fusing

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6.1 Overview
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6.1 Overview

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6.1 Overview

• ?? ?? ??
• Target System? ???? ???? ??? ??? 3?? ????? ????.
• Boot Loader
• ????? ????? kernel image? sdram? ???? ??? ????
  ??? ?? ????
• OS Kernel
• OS ? ?? ????
• Root File System
• Kernel ?? ??? File System

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6.1 Overview

• ?? ?? ??
• Target System? ?? ????? ???? ?? user file system?
  ?? ? ? ??.
• User File System
• Root file system ? ???? ?? util?? data file?? ??
  ????? ??? file system

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6.1 Overview

• What is Boot Loader?
• ???? ??? ? ?? ?? ???? ????
• Main Function
• Hardware Initialization
• CPU clock, Memory timing, interrupt, UART, ETC.
• PC? BIOS
• Kernel Load
• ?? ??? RAM? ???? ??.
• Additional Function
• Target board? ??? program? ???? ?? ???.
• Download Image to SDRAM
• Serial xmodem, uuencode
• Ethernet tftp, bootp
• Fusing Flash Rom
• Write, Read, Erase, Lock/Unlock

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6.1 Overview

• Kernel
• OS? ????? ???? ????
• Process management
• Memory management
• Device management
• Network management
• File System Management
• API (Application Programming Interface)
• ETC.
• Kernel Image
• Kernel ? ??? ??? boot loader? ?? ??? ???? sdram??
  load ??.
• ???? ?? ??? ????? ???? ?? ???? ?? ??? ??

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6.1 Overview

• Root File System
• / ????? ??? ?? ?? ????? ???? ???? ?? ????? ???
  ???? ? ?? ??? ??? ??.
• Kernel ?? ???? ??? ?? ? Root File System? ??? ??.
• Embedded System ? ??? ??? ??? ??? hard disk? ???
  ?? ? ?? ??? ?? Ramdisk? ???? Root File System?
  ????.

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6.1 Overview

• User File System
• Root file system ? ???? ?? util?? data file?? ??
  ????? ??? file system
• ?? ??? ???? target board? ?? ????? ???? ??? ????.
• Flash File System?? ??
• Ramdisk? ?? Flash Memory? ?? file system? ??? ?
• Flash Memory? ?? read/write ? hard disk? ???? ??
• ??? ?? ??? ?? ??? Flash Memory? ????.
• Flash memory? ???? ?? ??? ???? ???? ??? ??? ????
  ?? ??? ??? ? ??

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6.1 Overview

• JFFS2
• Journalling Flash File System
• Red Hat?? ??? flash file system?? linux kernel??
  ??
• ??? ????? ???? ?? ?? ??? ?? ?? ????, ramdisk?
  ???? ?? ?????? ???? ?? ??

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6.1 Overview

• Target ?? ??

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6.1 Overview

• Target Operating ?? 1
• Boot Loader

SDRAM
1. Power On
Boot Loader Linux Kernel RAMDISK JFFS2
2.Execute 0x00000000
3.Load Kernel
4. Load Root File System (RAMDISK)
FLASH Memory
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6.1 Overview

• Target Operating ?? 2
• Kernel

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6.2 Bootloader

• ????? ????? jtag?? flash? fusing ??.

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6.2 Boot Loader ??

• Bootloader? ??? ?? ???? ????? Toolchain? ?? ??
  ??? ??. Toolchain ??? ?? ? ? ? ??.
• Source ??? ????.
• tar zxvf iwmmxt-1.0.0.tar.gz

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6.2 Boot Loader ??
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6.2 Boot Loader ??

1. Boot Loader compile

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6.2 Boot Loader ??

• Compile? ????, boot? ??? ??.
• ????? boot? bootloader image??.

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6.2 Boot Loader ??

• lt JTAG program ?? gt
• What is JTAG?
• Joint European Test Access Group
• JTAG? PCB? IC? ??? ?? ?? ???? 1985? ???
• JTAG(Joint Test Action Group)? ?? ??? ????.
• Boundary Scan Test
• ? ??? Boundary Cell?? ?? ?? ??? ?? ?? ?? ????
  ????? ? ? ?? ??? ??? Cell? ?? ?? ??? ????? ??? ?
  ?? ?? ?? ???? ???? ?? ?? ?? ??? ? ??.

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6.2 Boot Loader ??

• lt JTAG program ?? gt
• JTAG ??
• ????(CPU)? ???? ???? ????? ?? ?? ?? ?????? ?? ??
  ?? ? ?? ??? ??
• ??? ??? ??? ??? ???? test
• ?????? ???? test
• Flash memory fusing

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6.2 Boot Loader ??

• lt JTAG program ?? gt
• PC? ?? JTAG ?? ??? ??

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6.2 Boot Loader ??

• JTAG ??

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6.2 Boot Loader ??

• JTAG Build
• JTAG ??? ?? ????? ????.
• Makefile ? ???? ???? make ??? ???? JTAG ??? ???
  ??. ???? ???? Jflashmm ?? ???? ??? ????.

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6.2 Boot Loader ??

• ????? Bootloader ???
• ??? ???? ????? ??? ???? jflashmm? ???? ???
  ???? Fusing ??.
• jflashmm ????? ??? JTAG ???? ??? ??? PC? ???
  ??? ???? ????? ????? Fusing ? ? ??.
• roothost ./jflashmm pxa27x32.dat boot

???? ???(boot)? cpu? flash ???? ?? ???
???(pxa27x32.dat)?? ?? ????? ??.
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6.2 Boot Loader ??

• Bootloader Fusing
• JTAG? ?? flash 0??? ???? fusing

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6.3 Kernel Image
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6.3 Kernel Compile
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6.3 Kernel Compile

• ??? ?? (CD ? ?? ??)
• lt??? ??? ??gt
• - X-Hyper270-TKU Kernel linux-2.6.11-h270-tk
  u_v1.1
• ??? ???? ??
• X-Hyper270-TKU Kernel linux-2.6.11-h270-tku_
  v1.1.tar.gz

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6.3 Kernel Compile

• X-Hyper270-TKU Kenel? linux-2.6.11-h270-tku_v1.1.t
  ar.gz? compile ?? zImage? ??
• Kernel source? ?? ????? ????. ?? ?? ????
  X-Hyper270-TKU ??? ? ? menuconfig ???? ????.
• make xhyper270tku_deconfig? kernel ??? ???
  TKU??? ??? ?? ?? ??. makemenu config? ?? ???
  kconfig ??? ????.
• make zimage? ???? ?? ? ???? ??? ???? ?????.

/Kernel cd linux-2.6.11-h270-tku_v1.1 /linux-2.6.11-h270-tku_v1.1 make xhyper270tku_defconfig /linux-2.6.11-h270-tku_v1.1 make menuconfig /linux-2.6.11-h270-tku_v1.1 make zImage
??? ??? ???? ?????.
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6.3 Kernel Compile

• ???? kernel ???? /tftpboot ? ??
• cp ./arch/arm/boot/zImage /tftpboot/
• bootloader? ??
• minicom? ?? ??.
• bootloader command mode? target system booting

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6.4 rootfile-system image
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6.4 jffs2 file system
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6.4 jffs2 file system

• mkfs.jffs2 ??
• jffs2 file system? ??? ???? mkfs.jffs2 ?????
  ????.
• Host? ?? ???? ???? ???? ??? ????.

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6.4 jffs2 file system

• flash? ?????? Jffs2 image? mkfs.jffs2 ??
• ????? ?? image? ???.
• ??? ?? ???? ?? ?? ???? ???.

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6.4 jffs2 file system

• mkjffs2 ???
• ????? ??? ??? ??.

• ??? rootfs.img ???? bootloader? ??? ???? ? ? ??
  ??
• flash? write? ??? ??.

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6.5 FUSING
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6.5 FUSING

• Fusing
• ??? tftp ??? ??? ?? ??
• hybusgttftp zImage kernel
• hybusgtflash kernel
• hybusgttftp rootfs.img root
• hybusgtflash root

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6.5 FUSING

• Booting linux kernel
• ????? ???? ?????? ?????? ? ??? ???. ??? boot????
  booting??? reset ??? ?? ?????? ? ?????.
• hybusgt boot
• ?????? ? ????? ????.
• ??? ?????? ?? fusing? ???.

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6.6 Bootloader ???
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Bootloader Command(?)

• Bootloader ???
• ??? ???? ????? ?? ???? ????? ??? ??? ??? ???
  ??.(EMPOS II? ???? ??)
• Help Command mode?? ?? ??? ???? ????

gthelp
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Bootloader Command (?)

• bootp Host PC???? bootp? ?? Target board?
• IP? ?? ?? ? ?? ??

gtbootp
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Bootloader Command (?)

• setip bootp? ???? ?? ?? ip ???? ???

gtsetip 192.168.0.5 192.168.0.7
Host PC IP
Target Board IP
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Bootloader Command (?)

• macwrite MAC Address ?? ???
• Mac Address ??? ??? Host PC? /etc/bootptab???
  Tartget Board? Mac Address? ha? ?? ? ?? ??????.

gtmacwrite pri 000ba8000000
?? eth(sec ?? sec?)
?? MAC Address
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Bootloader Command (?)

• tftp ????? ??? ???? ?? ???? ?? ???

gttftp zImage kernel
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Bootloader Command (?)

• read ?? ??? ??? ?? ?? ?? ?? ???

gtread b32 0x48000000
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Bootloader Command (?)

• write ??? ??? ???? ?? ???? ?? ???

gtwrite b32 0x4800000C 0x12BC5554
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Bootloader Command (?)

• flash ??? ?? ???? Flash??? ???? ???

gtflash kernel
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Bootloader Command (?)

• erase Flash Rom? ???? ???? ???? ???

gterase kernel
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Bootloader Command (?)

• Status Flash ???? ?? ???(booter, kernel,
  ramdisk, usr)? ??? ?? ??? ???? ???? IP? tftp ???
  ?? Host PC? IP, ? ???? MAC Address? ?? ???? ?? ?
  ? ?? ???

gtstatus