Beaglebone Black GPIO Mapping

[blucas986]

I am attempting to use a BeagleBone Black (BBB) Wireless A5, and have run into a few minor issues that required steps in addition to the setup instructions on your website. My background is mainly in embedded micro-controllers so I am somewhat new to embedded Linux. I am using Debian GNU/Linux 10 (buster) and have gone through all of the recommended updates/upgrades on Beaglebone website (https://beagleboard.org/upgrade) prior to following your setup instructions (https://github.com/Dan-in-CA/SIP/wiki/installation). Below are some additional steps taken to get sip.py to run smoothly. 

1. "nginx" was using port 80, so I disabled it, which allowed spi.py to load without error and I can now access the SIP's home page in my browser using the IP address of the BBB.
   
2. I was getting a GPIO error and realized Adafruit_BBIO.GPIO was not installed, so I followed the manual install instructions (https://pypi.org/project/Adafruit_BBIO/), which allowed sip.py to load without the GPIO error.
   

My question is how do the pins map between the P1 on the Pi and P9 on the BBB? 

I see the schematic for the Pi on the relay board wiki (https://github.com/KanyonKris/relay_board/wiki), which lines up with the pin mapping shown in gpio_pins.py, but I am having a hard time figuring out which corresponding pins to use on the BBB.  I have already installed the relay board plug-in and it appears to be working correctly from a software perspective.