In our IMX8QXP M4 core application we are using #AF28, #AH30 pads for M40__UART0 function use case.
The current SCU FW does not allow to change MUX setting for these particular pins.
There was an reply from NXP regarding this issue:
in board.c (in the SCFW porting kit)
the SCFW is marking them as owned by
the SCU by default: (void)
So you will have to remove/comment the
highlighted part above on the SCFW,
build it and build your image with the
modified SCFW and that should allow
you to configure those pads.
Is there IMX8 Colibri SCFW Porting Kit available somewhere so I can make the changes and rebuild SCFW?