http://linux-sunxi.org/Cubieboard/Programming/StatusLEDs
Accessing the status LEDs
The Cubieboard has two status LEDs, a green one and a blue one. These can be accessed and switched on and off with the following instructions.
Preparation
You need to have a bootable image with a recent kernel (3.x).
Add the following lines to your script.bin
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[leds_para]leds_used = 1
leds_num = 2
leds_pin_1 = port:PH20<1><default><default><0>
leds_name_1 = "green:ph20:led1"
leds_pin_2 = port:PH21<1><default><default><0>
leds_name_2 = "blue:ph21:led2"
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Access
Enable an LED (blue, in this case):
echo 255 > /sys/class/leds/blue\:ph21\:led2/brightness
Switch off an LED (blue, in this case):
echo 0 > /sys/class/leds/blue\:ph21\:led2/brightness
Blinking an LED (blue, in this case):
echo timer > /sys/class/leds/blue\:ph21\:led2/trigger
Use an LED (blue, in this case) to show SD card activity
echo mmc0 > /sys/class/leds/blue\:ph21\:led2/trigger
For others available triggers, run the command
cat /sys/class/leds/blue\:ph21\:led2/trigger
实际使用：
echo 0 > /sys/devices/platform/leds-sunxi/leds/blue:ph21:led2/brightness
echo 255 > /sys/devices/platform/leds-sunxi/leds/blue:ph21:led2/brightness
确定是那个盒子。