Bare-metal ARM Cortex M7 port with UART driver only

[Mehran47]

I have a bare-metal CPU, ARM Cortex M7, in a board that has a UART.

I want to port MicroPython with minimum configurations, just UART on the COM port.

We are currently building this version: MicroPython/ports/bare-arm
I make the file in Linux and flash the ELF file to the memory using ARM Development Studio.

I just wanted to know how and where to start?

Regards