3 LEDs are managed by BananaPI's NIC interface : Yellow, Green (on the Ethernet connector) and the Blue one (close to it).
By default, the Yellow LED lights when it receiving the carrier from the network (network links) whereas the Green and Blue one are flashing simultaneously as per network activities ... a bit useless to have the same function isn't it. Fortunately, RTL8211E, which is driving NIC interface can be programmed thru MII/MDIO-Interface.

BananaLEDd is a daemon being able to :

• to configure basic behaviors of ethernet's adapter LEDs
• make your LED blinking as per system load and stat disk activities.

Get the archive at the bottom of this page, extract if somewhere then compile the source code

gcc -Wall -O2 -o BananaLEDd BananaLEDd.c

I suggest to put the generated binary in /usr/local/sbin

    -h : this online help
    -d : enable debug messages
    -f<file> : read <file> for configuration
        (if not provided looks for '/usr/local/etc/BananaLEDd.conf')

The following keywords are understood from configuration file

Blue=<opts>     : behaviors of the blue led
Yellow=<opts>   : idem for the Yellow one
Green=<opts>    : and the Green one

LED=<device>=<opt>	: idem for an user servicable LED that is exposed on sysFS 
	(i.e. green:ph24:led1)

Where opts can be

10 - Linked to a 10Mb network
100 - Linked to a 100Mb network
1000 - Linked to a 1Gb network
LINKED - Linked to any type of network (equal to "10 100 1000")
NETWORK - blinks as per network activities

SATA - Follows as per disk activities
LOAD - reflect System load

SATA and LOAD are the only options that have to be specified alone.

10, 100, 1000, LINKED and NETWORK can't work on SysFS LEDs

Other configuration keywords are :

LEDDevice=   - whitch device to use to access to LEDs (eth0)
Disk=        - disk to monitor (sda)
Sample=      - Delay b/w 2 sample (default : 100ms)
MinBlink=    - Minimum load to reflect (defaut 2)
MultBlink=   - Blink multiplier (default 100)

Minimum blink result is (MultBlink/2) / (MinBlink * Sample)

Comments start by a dash #

BananaLEDd needs to be launch as root.

The simpliest way is

./BananaLEDd -d -fBananaLEDd.conf

Here the startup script I'm using :

#!/sbin/runscript
# Copyright Laurent Faillie 2014
#
# Start/Stop BananaLEDd daemon on OpenRC system (tested on Gentoo)

depend() {
    need net
}

DMKDEM_BIN=${DMKDEM_BIN:-/usr/local/sbin/BananaLEDd}
DMKDEM_PID=${DMKDEM_PID:-/var/run/BananaLEDd.pid}

start() {
    ebegin "Starting BananaLEDd's daemon"
    start-stop-daemon --start --exec ${DMKDEM_BIN} 
        --interpreted 
        --background --make-pidfile --pidfile ${DMKDEM_PID}
    eend $?
}

stop() {
    ebegin "Stopping BananaLEDd's daemon"
    start-stop-daemon --stop --exec ${DMKDEM_BIN} 
        --pidfile ${DMKDEM_PID}
    eend $?
}

• v1.0 - 16/11/2014 - First version
• v1.1 - 08/01/2015 - Correct LOAD blinking - "Je suis Charlie" version.
• v1.2 - 21/03/2015 - Add SysFS LEDs