Mini2440
Contents
About
This is a howto install uboot and a new kernel on the mini2440. Big thanks to BusError for the instructions and guidance. DISCLAIMER: This worked for me, if it eats your cat or burns your kitchen sink, don't blame me.
Preparations
Toolchain
I used this one: http://www.codesourcery.com/sgpp/lite/arm/portal/package3696/public/arm-none-linux-gnueabi/arm-2008q3-72-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2
Add the bin dir to the $PATH. If you have a toolchain with another prefix (like arm-linux-) adapt the CROSS_COMPILE environment variable in the next steps.
Setting up the bootloader
Compiling uboot
Clone the git tree:
mkdir uboot ; cd uboot git clone git://repo.or.cz/u-boot-openmoko/mini2440.git
Setup cross compiling:
export CROSS_COMPILE=arm-none-linux-gnueabi-
or edit your .bashrc eg.
export CROSS_COMPILE=arm-none-linux-gnueabi- export PS1="\[\033[1;34m\]\u \[\033[0m\]\w:\$: \[\033[0m\]" #export PS1="\u:\w\$>" LS_OPTIONS="--color=auto" alias ls="ls $LS_OPTIONS"
Prepare the mini2440 target:
cd mini2440 make mini2440_config
Compile:
make all
This will give you a "u-boot.bin". If you get an error about a missing whatever-gcc, verifiy if there is a hardcoded CROSS_COMPILE setting in the Makefile
Flashing uboot
We use the installed vivi bootloader to load uboot via usb. Power the board off, set the NOR switch to on, power the board on. You'll get the vivi output on the serial console. Press 'q' to go to the shell and do the "load flash" on address 0 with the size of "u-boot.bin" (238232 bytes in this example):
[q] Goto shell of vivi Enter your selection: q Supervivi> load flash 0 238232 u USB host is connected. Waiting a download.
Use the "s3c2410_boot_usb" utility (http://mini2440.googlecode.com/files/s3c2410_boot_usb-20060807.tar.bz2) to upload the "u-boot.bin" via usb:
./s3c2410_boot_usb u-boot.bin
You'll see something like this as output, ignore the error message:
csum = 0x9a6e send_file: addr = 0x33f80000, len = 0x0003a298 Error downloading program
and this on the serial console:
Now, Downloading [ADDRESS:30000000h,TOTAL:238242] RECEIVED FILE SIZE: 238242 (232KB/S, 1S) Downloaded file at 0x30000000, size = 238232 bytes Found block size = 0x0003c000 Erasing... ... done Writing... ... done Written 238232 bytes Supervivi>
Then you see
MINI2440 # saveen Saving Environment to NAND... Erasing Nand...nand_erase: attempt to erase a bad block at page 0x00000260
Try
MINI2440 # nand scrub ... Really scrub this NAND flash? <y/N>
press y and enter. After erasing make
MINI2440 # nand createbbt
press y and enter. Now you can save the environment
MINI2440 # saveenv
Now power off the board, set the NOR switch back to off, and power on the board. We verify the version and then prepare config storage in flash:
MINI2440 # version
U-Boot 1.3.2-dirty-moko12 (Mar 8 2009 - 13:50:19)
MINI2440 # dynenv set 40000
device 0 offset 0x40000, size 0x3fc0000
45 4e 56 30 - 00 00 04 00
MINI2440 # saveenv
Saving Environment to NAND...
Erasing Nand...Writing to Nand... done
MINI2440 # reset
Configure uboot
do a "printenv" to show active settings. Adjust the IP for uboot and the tftp server. We need proper IP connectivity to load the kernel with tftp. "setenv" is your friend. "saveenv" stores the setting to flash.
Kernel
Compilation
Fetch from git:
mkdir kernel ; cd kernel git clone git://repo.or.cz/linux-2.6/mini2440.git cd mini2440 mkdir -p ../kernel-bin
Generate .config from mini2440 template:
CROSS_COMPILE=arm-none-linux-gnueabi- ARCH=arm make O=../kernel-bin/ mini2440_defconfig
Compile kernel and modules:
CROSS_COMPILE=arm-none-linux-gnueabi- ARCH=arm make O=../kernel-bin/
Generate "uImage" with the "mkimage" tool:
../uboot/mini2440/tools/mkimage -A arm -O linux -T kernel -C none -a 0x30008000 -e 0x30008000 -d ../kernel-bin/arch/arm/boot/zImage /tftpboot/uImage
Flash kernel
Verify partitions, we need the offset for the kernel partition (probably 0x60000):
mtdparts
Erase the kernel partition:
nand erase 60000 <padded size>
Load the kernel with uboot into ram:
tftp 0x32000000 uImage
Note the size, pad it to 512 byte and use the nand write command to flash it:
nand write 32000000 60000 <padded size>.
Configure uboot
We use a nfs chroot for now:
setenv bootargs console=ttySAC0,115200 noinitrd init=/sbin/init mini2440=1tb ip=192.168.80.12 root=/dev/nfs rw nfsroot=192.168.80.1:/home/public/arm
This is helpful for automatic booting:
setenv bootcmd 'nboot.e kernel ; bootm'
Setting up embedian
Follow this nice howto from BusError http://code.google.com/p/mini2440/wiki/Emdebian
Troubleshooting
Write errors
When you have bad blocks in NAND, you'll get write errors. This gives more information: http://wiki.openmoko.org/wiki/NAND_bad_blocks
Clear the flash (do not reset the board till uboot is reinstalled, or you need to use NOR/vivi to reinstall uboot via usb):
nand scrub
Create new bad blocks table:
nand createbbt
Reflash uboot (use the size in the output from the tftp command and pad it to hit 512 byte boundaries for the nand write command)
tftp 0x32000000 u-boot.bin nand write 32000000 0 <size of u-boot.bin> reset
Create dynamic partitions:
dynpart dynenv set u-boot_env saveenv reset
And then use write.e to write to the mtdparts, e.g.:
tftp 0x32000000 uImage nand write.e 32000000 kernel nboot.e kernel
Links
http://bliterness.blogspot.com/
http://code.google.com/p/mini2440/
http://blog.cor-net.org/ (Qt 4.5 on mini2440)
