How to disable M4 core for imx8mmevk

[nicklau]

Hi,

How to disable M4 core in IMX8MMEVK project? If i wanna use the debug serial port UART4 of M4 as the general serial port of A53, what modifications need to be made in terms of software and hardware?

Thanks.

[andrewgupta33]

I had Same question but need to elobrate it more. Thanks  McDVoice  @nick lau 

[nicklau]

Can anyone give me some advice?

[joanxie]

refer to the schematic, uart4 is for M4 debug, you can assign uart4 to A53 domain, you can refer to the function "_early_platform_setup2" in the imx8mm_bl31_setup.c,