SCU_CTL_SCU_ENA
bus_space_read_4(bst, bsh_scu, SCU_CTL) | SCU_CTL_SCU_ENA);
scu_ctl |= SCU_CTL_SCU_ENA;
bus_space_read_4(bst, bsh, SCU_CTL) | SCU_CTL_SCU_ENA);
val |= SCU_CTL_SCU_ENA;
bus_space_write_4(bst, bsh, SCU_CTL, val | SCU_CTL_SCU_ENA);
scu_ctl |= SCU_CTL_SCU_ENA;