busybox

下载地址
http://www.busybox.net/downloads/

制作文件系统
编译步骤省略

# mkdir lib etc proc tmp sys
# arm-linux-strip *.so

# vi etc/inittab
::sysinit:/etc/init.d/rcS 
::askfirst:-/bin/sh
::ctrlaltdel:/sbin/reboot
::shutdown:/bin/umount -a –r
::restart:/sbin/init

注：/bin/sh前须要添加前缀“-”，否则会提示以下错误：

/bin/sh: can't access tty; job control turned off 

# mkdir etc/init.d
# vi etc/init.d/rcS
mount -t tmpfs mdev /dev    
mkdir /dev/pts  
mount -a  
echo /sbin/mdev > /proc/sys/kernel/hotplug  
mdev -s  
exec /usr/local/rc.local

# chmod +x rcS

rc.local 是默认启动的最后一个脚本文件

# vi usr/local/rc.local
#!/bin/sh
insmod led.ko
/home/led_app

# vi etc/fstab
# device    mount-point    type    options    dump   fsck order
none     /proc          proc   defaults   0      0
none     /tmp           tmpfs  defaults   0      0
none     /sys           sysfs  defaults   0      0
none     /dev/pts       devpts defaults   0      0