MMU: force identity mapping without pages?

hi,

on a cortex a53, I would like to get the best of both worlds. Having dcache enabled but no page walk in case of a miss.

I want no memory protection because we manage the whole system ( kind of baremetal processes)

Is there a way to tell the mmu controller that we are in identity mapping for the whole memory available, so that a page walk is not triggered?

thanks