Definition of GPIO.SUNXI in OPi-GPIO

[twinclouds]

I under stand OPi-GPIO is a drop-in replacement library for RPi.GPIO for the Orange Pi Zero.  It added a new GPIO pin definition GPIO.SUNXI.  However, I cannot find its definition.  Can somebody let me know or point me to a link where it is defined?  Thanks.

[billybangleballs]

http://linux-sunxi.org/GPIO will be a good place to start