UART1: this UART is routed to connector J42 that is typically used for console.
UART2: this UART is routed to connector J46 that is dedicated to optional [[Wireless_Module_(DWM)|DWM WiFi/Bluetooth module]]. Even if DWM is populated, non no electrical conflicts occur.
USBOTG1: this interface is connected to J55. The use of this port is user defined.