Hi Mike,
You can enable / disable the MMU by writing to
the CP15 registers. This can be done with the
J-Link GDB Server via remote commands.
To read a CP15 register:
CP15 <CRn>, <CRm>, <op1>, <op2>
To write a CP15 register:
CP15 <CRn>, <CRm>, <op1>, <op2> = <Value>