I tried the following from an Onion article related to the leds but nothing worked:
(for example the mod-ledtrig-morse couldn't be installed)
opkg update && opkg install mod-ledtrig-morse
echo morse > /sys/class/leds/onion:amber:system/trigger
cat /sys/class/leds/onion:amber:system/trigger
echo Hello, Onion > /sys/class/leds/onion:amber:system/message
root@Omega-12D9:~# cat /sys/devices/platform/leds-gpio/leds/onion:amber:system/delay 50
echo 100 > /sys/devices/platform/leds-gpio/leds/onion:amber:system/delay
echo default-on > /sys/class/leds/onion:amber:system/trigger
gpioctl dirout 1
echo 100 > /sys/devices/platform/leds-gpio/leds/onion:amber:system/delayecho 100 > /sys/devices/platform/leds-gpio/leds/onion:amber:system/delay