1. Embedded Linux porting Kernel
Speaker: Yi-Ji Jheng
Date:

2. Outline
Embedded Linux porting - Kernel

3. Embedded Linux porting Kernel

4. Target Board
LAN
DSP
WAN
Console
port
MIPS
8MB * 2
SDRAM
4MB
FLASH

5. Source environment
hardphone/
|-linux _mvl21.tar.gz
|-opt.tar.gz

6. Install Toolchain #tar zxvf opt.tar.gz
#PATH=$PATH:/usr/src/hardphone/opt/hardhat/devkit/mips/lexra_fp_be/bin
#PATH=$PATH:/usr/src/hardphone/opt/tools

7. Make Kernel #tar zxvf linux-2.4.17_mvl21.tar.gz
#cd ./linux _mvl21
#make clean && make mrproper
#cp ./sd.config ./.config
#touch ./arch/mips/ramdisk/ramdisk.gz
#make menuconfig
#make dep
#make zImage

8. Download in Target Board
1. Use Winscp to get zImage on PC
2. Setup Target Board
3. Execute and setup tftp
4. Execute and setup Super Terminate
5. Load Kernel Image on Target Board
6. Run

9. Work
Implement below pic.

10. replenish

11. Toolchain for compiler
mips_lexra_fp_be-g++
mips_lexra_fp_be-cpp
mips_lexra_fp_be-gcc
mips_lexra_fp_be-ld
mips_lexra_fp_be-as
mips_lexra_fp_be-strip .

12. Toolchain for mkimage
Add header on Kernel image to tell BootLoader some info.
Header is 64 Byte (0x40)
-a  set load address to ''addr'' (hex)
-e  set entry point to ''ep'' (hex)
-C  set compression type 'comp'

13. Point to menuconfig (1/2)
Target Board
Machine selection --->
[*] Support for Lexra LX-PB20K board
(19200) Default BAUD Rate
CPU
CPU selection --->
(Lexra_LX45XXX) CPU type

14. Point to menuconfig (2/2)
Network device
Network device support --->
[*] Network device support
Ethernet (10 or 100Mbit) --->
[*] Ethernet (10 or 100Mbit)
[*] MIPS SD9218 embedded ethernet controller support
Cross compiler
Kernel hacking --->
[*] Are you using a crosscompiler

15. Makefile Find a parameter that call CROSS_COMPILE
CROSS_COMPILE = mips_lexra_fp_be-

16. No ramdisk.gz error
make[1]: Entering directory `/usr/src/hardphone/linux _mvl21/arch/mips/ramdisk'
make[1]: *** No rule to make target `ramdisk.gz', needed by `ramdisk.o'. Stop.
make[1]: Leaving directory `/usr/src/hardphone/linux _mvl21/arch/mips/ramdisk'
make: *** [_dir_arch/mips/ramdisk] Error 2

17. Kernel Image of Location
arch/mips/zboot/zImage
474Byte

18. Setup Target Board
Ethernet - LAN
Console
port
Power

19. Execute and setup tftp
Where does kernel image ?

20. Execute and Setup Super Terminate (1/3)
Any name

21. Execute and Setup Super Terminate (2/3)
Select your console port

22. Execute and Setup Super Terminate (3/3)

23. Load Kernel Image in Target Board
Power on hardphone
Press any key into the Boot Mode, otherwise go into Linux

24. Boot Mode Command ? - print this menu f - load from Flash and go
l - load from TFTP server to SDRAM, no go
(no save to Flash)
L - load from TFTP server to SDRAM and go
@ - load from TFTP server to SDRAM, no go
(save to Flash)
b - show boot parameters
c - change boot parameters
p - ping test (ping other station from the target)

25. Setup that Download from tftp
BOOT> c
tftp server – <tftp ip>
tftpfile zLinuxR.img – <kernel image name>
ip address – <target board ip>
subnetmask – <netmask>
gateway – <defauly gw>
bootstate <default>

26. Kernel panic Be very happy to see that
We don’t make ramdisk.gz, so we don’t mount file system