IO_MAP_REG
pcs->rgd = (m1 == PCIM_CMD_MEMEN)? MEM_MAP_REG : IO_MAP_REG;
pcs->rgd = (m2 == PCIM_CMD_MEMEN)? MEM_MAP_REG : IO_MAP_REG;
device_printf(dev, "using %s space register mapping\n", (pcs->rgd == IO_MAP_REG)? "I/O" : "Memory");