uart 1 txd      P9.24
uart 1 rxd      P9.26
uart 1 rts      P9.19           conflicts with cape i²c bus
uart 1 cts      P9.20           conflicts with cape i²c bus

uart 2 txd      P9.21
uart 2 rxd      P9.22
uart 2 rts      P8.38           conflicts with video
uart 2 cts      P8.37           conflicts with video

uart 3 txd      P9.42
uart 3 rxd      -               unavailable
uart 3 rts      P8.34           conflicts with video
uart 3 cts      P8.36           conflicts with video

uart 4 txd      P9.13
uart 4 rxd      P9.11
uart 4 rts      P8.33           conflicts with video
uart 4 cts      P8.35           conflicts with video

uart 5 txd      P8.37           conflicts with video
uart 5 rxd      P8.38 or P8.31  conflicts with video
uart 5 rts      P8.32           conflicts with video
uart 5 cts      P8.31           conflicts with video

pru uart txd    P9.17 or P9.24
pru uart rxd    P9.18 or P9.26
pru uart rts    P9.21 or P9.19
pru uart cts    P9.22 or P9.20