PMC_SIZE
bus_space_map(fdtbus_bs_tag, PMC_PHYSBASE, PMC_SIZE, 0, &pmc);
bus_space_unmap(fdtbus_bs_tag, pmc, PMC_SIZE);
if (bus_space_map(fdtbus_bs_tag, PMC_PHYSBASE, PMC_SIZE, 0, &pmc) != 0)