System LED

[stephen fleming]

I am curious about what the purpose of the LED next to the charge LED on the board is. On the pin-out diagram of the expansion connector it is identified as System LED.

This LED is software programmable, and no dedicate assigned function.

Please consider telling us to which pin it is connected, then using longsleep's minimal Ubuntu image, define it in the .dts file and then put something like 

Code:

(echo heartbeat >/sys/class/leds/green_led/trigger ; sleep 60 ; echo none >/sys/class/leds/green_led/trigger) &

in /etc/rc.local. This way you could provide a small 'DOA-or-not.img' every user can use to see whether the board boots at least or not.

According to the schematic diagram, the user programmable LED is controlled by PL7 on the A64 CPU.