I am running Ubuntu Mate on a Raspberry Pi 2B.
I would like to find which GPIO pin is currently used for the heartbeat, i.e. activity, so I can attach an external LED.
The config.txt entry is like so:
## act_led_gpio
## Set which GPIO to use for the activity LED
##
## In case you want to connect it to an external device
##
## Default 16 on a non-Plus board, 47 on a Plus or Pi 2.
##
#dtparam=act_led_gpio=47
There are only forty pins, so it can't be physical pin 47, or the GPIO BCM numbering. Does anyone know which system is used here?