Does the log pick it up? It should show up under MI Memmap when the log is at level DEBUG or INFO. The other thing to try is to change the address to the 0x8XXXXXXX mirror. i.e. change the breakpoint to 810e0250.
The other thing is, I haven't tested the memory breakpoints in a fair few months now - it might be broken.
The other thing is, I haven't tested the memory breakpoints in a fair few months now - it might be broken.