4 Change UART Instance

Normally, the default PINs configurations of MCU_UART0 and WKUP_UART0 serial ports are not suggested to be modified during the customers’ hardware design stage. The reason is that ROM code uses the default pin setting of MCU_UART0 when doing OSPI burning, and SYSFW uses the default pin setting in WUKP_UART0. However, due to PIN conflicts and other reasons, MAIN_UARTX is often changed to a new serial port. Moreover, in multi-core debugging, a separate MAIN_UARTX serial port is often required to be configured for the DSP/MAIN_R5F core for debugging purpose.