SCU_DIAG_CONTROL
val = bus_space_read_4(bst, scu_bsh, SCU_DIAG_CONTROL);
bus_space_write_4(bst, scu_bsh, SCU_DIAG_CONTROL, val);
bcm53xx_armcore_bsh, ARMCORE_SCU_BASE + SCU_DIAG_CONTROL);
ARMCORE_SCU_BASE + SCU_DIAG_CONTROL, diagctl);