STM32H747i How to work on M4 CPU

[WHMJJ]

Project setup:

Board: stm32h747i_disco

Target CPU: Cortex-M4

Build command:
west build -p -b stm32h747i_disco/stm32h747xx/m4 -- "-DDTC_OVERLAY_FILE=boards/stm32h747i_disco_m4.overlay"

Problem description:
I’m trying to run my application on the M4 core of the STM32H747I-DISCO board and use UART8 as the debug output.
However, when I move the same UART8 debug code from the M7 to the M4 build, there’s no message output on UART8.

When I build and run the same UART8 configuration on the M7 core, it works correctly (debug messages appear as expected).

Overlay file used (stm32h747i_disco_m4.overlay):
`
/ {
chosen {
zephyr,console = &uart8;
zephyr,shell-uart = &uart8;
};
};
&usart1 {
status = "disabled";
};

&uart8 {
status = "okay";
pinctrl-0 = <&uart8_tx_pj8 &uart8_rx_pj9>;
pinctrl-names = "default";
current-speed = <115200>;
};`

Question:
Is there anything special I need to modify or enable in the M4 core build to make UART8 work?
Since UART8 works fine on the M7 core, I’m wondering if additional configuration is needed for peripheral access or clock setup when using it from M4.