how-to setup busy box ?

The busybox could be cross compiled for arm-none-linux-gnueabi-gcc.
It is cross compiled with static link option.
make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi-
User could cp the busybox to /system/bin of the target sd card.

//install manually
adb shell
su
mount -o rw,remount -t yaffs2 /dev/block/mtdblock3 /system
exit
adb push busybox /data/local
adb shell
cd /system
ls -al


cd /data/local
chmod busybox 755
/data/local/busybox cp /data/local/busybox /system/xbin/busybox
cd /system/xbin
chmod busybox 755
./busybox --install -s /system/xbin
rm /data/local/busybox