DRA821U: Switch console to UART5,DFU can not flash boot files

Tool/software:

Hi,TI

 I have switch console from UART0 to UART5,following this passage:

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/988278/faq-tda4vm-j721e-j7200-how-to-switch-console-to-a-different-uart-instance;

I have successfully changed UART2 to UART3 on the development board，but the same method to UART5 cannot be implemented on out custom board.

DFU only burned tiboot3.bin（UART5 version） and then exited automatically.Since the serial port had changed, I couldn't know what happened.

Is there anything else I need to pay attention to when using UART5 as a console?

This is part of the k3-j7200-common-proc-board.dts content：

aliase {

      serial5 = &main_uart5;

};

chosen{

      stdout-path = "serial5:115200n8" //only serial2 can boot!!!

};

&main_pmx0{

    console_pins_default:console_default_pins{

        pinctrl-single,pins = <

          J721E_IOPAD(0x8,PIN_INPUT,11)

          J721E_IOPAD(0x4,PIN_OUTPUT,11)

        >;

    }

}

&main_uart5{

    status = "okay";

    pinctrl-names = "default";

    pinctrl-0=<&console_pins_default>;

};

}

SDK version:PROCESSOR-SDK-LINUX-RT-J7200 10.00.07.03