Going through double checking all pins before producing my own expansion board I noticed UART4 has a discrepancy between datasheet and the schematic of the expansion boards.
Datasheet (version 0.3) uses
UART4_RX (GPIO 155) - J2 Pin 6
UART4_TX (GPIO 156) - J2 Pin 7
Parlor And Chateau Schematics shows J2 as A and has the following
UART4_RX - A7
UART4_TX - A6
I am going to assume the schematics are correct, just wanted to confirm this prior to finalizing my design.