AM263P4-Q1: Cannot configure UART for 1MBps via Syscfg

Part Number: AM263P4-Q1
Other Parts Discussed in Thread: AM2632-Q1

I am working a BMS project using teh AM263P4-Q1 connected to a 79731.  I am tring to confiogure UART2 to communicate at 1Mbps in Syscfg.  Syscfg does allow me to confgirue that speed.  It tops out at 920Kbps.  Syscfg appears to be missing the ability to change the clock source and Clokc freqeuncy for UART.

I am another design using a AM2632-Q1.  Syscfg for that device allows selection of the clock source and the clock frequency.  I was able to set the speed correctly.