PROCESSOR-SDK-J722S: J722s how to modify mcu_uart0 input source freq?

Tool/software:

Hi TI expert,
    1. i am using J722s evm  and sdk v11  example code as environment. sdcard, spl boot mode.

    2. my target is to set mcu_uart0 baudrate at 2M,   it seems not possible by default 48M input source clock.  

    3. i use syscfg-gui to set 2M baudrate, the actual baudrate  measured is around  1.832M.

my question is:
1. how set mcu_uart0 baudrate at 2M,   

thanks