1. 2010. 10 안양대학교 전기전자공학과 서 삼 준 Kernel Fusing (Boot Loader & tftp 활용 )

2. Contents JTAG Interface Flash ROM memory block Boot Loader Commands Image Fusing – Boot Loader : empos_boot – Kernel : zImage – RAM disk : ramdisk16.gz – Qtopia : qtopia.jffs (jffs image)

3. JTAG Write Direct write: JTAG interface (download and erase + write) Indirect write: tftp protocol + boot loader command –tftp empos_boot booter, flash booter Ethernet JTAG I/F Target BoardLink PC 1st port Tftp: /tftpboot/dlfile NFS: /nfs_resources Jflash-Xcale dlfile command Boot loader (0x0c000) 0x0000 0000 – 0xa3d0 0000 kernel (0x10 0000) 0x000c 0000 - 0xa00c 0000 RAMdisk (0x60 0000) 0x0020 0000 – 0xa060 0000 /usr (0x170 0000) 0x90 0000 – 0xa160 0000 Working space Parallel portJTAG port DRAM area (128Mbytes) command Flash ROM: 32Mbutes

4. Memory Map Flash ROM area + SDRAM area Boot loader Environment values Kernel Image ramdisk /usr (user space) null Flash ROM Area (32Mbyes) 0x0 0000 0x8 0000 0xc 0000 0x20 0000 0x1c 0000 0x90 0000 0x80 0000 0x200 0000 SDRAM Area (128Mbyes) 0xa00c 0000 0xa800 0000 Kernel Image ramdisk Boot loader (temporary)

5. Jflash-Xscale command

6. Download using Boot Loader

7. Boot Loader Boot Loader 수행 화면

8. Status Commands Memory Map, Network Status, Register Value

9. Experiment: Kernel fusing Interface 설정 : serial port, Ethernet, JTAG interface Target board 의 상태 확인 : status (boot loader) Set environment: IP address(setip), MAC address(macwrite) tftp 를 이용하여 데이터 전송 – tftp empos_boot booter – tftp zImage kernel – tftp ramdisk16,gz ramdisk Flash ROM 에 저장 : flash command – flash booter, flash kernel, flash ramdisk, flash usr 필요한 경우 삭제 : erase command – erase kernel – erase 0x0 0xc0000

10. Example of Kernel Fusing

11. Fusing Files 경로 및 파일명설 명 /Image/bootloader/empos_boot 부트로더 /Image/kernel/zImage 커널 /Image/filesystem/ramdisk/ramdisk16.gz 램디스크 /Image/filesystem/qtopia/qtopia.jffs user 영역 (qtopia 용 jffs 이미지 ) /Image/filesystem/tinyx/tinyx.jffs user 영역 (tinyx 용 jffs 이미지 )

12. Experiment 개발환경에 맞도록 kernel 과 RAM disk 를 fusing –IP address, bootp, tftp 등 –Hosts –Herald message Jflash-Xscale 소스 분석과 memory map 이해 –Flash ROM 구조 (block mode) 에 따른 Jflash-Xscale 소스를 분석 Report –Jffs, ext2 파일 구조 조사