VIGRA_REG_RAMDAC
if (sbus_bus_map(bt, sa->sa_reg[VIGRA_REG_RAMDAC].sbr_slot,
sa->sa_reg[VIGRA_REG_RAMDAC].sbr_offset,
sa->sa_reg[VIGRA_REG_RAMDAC].sbr_size, BUS_SPACE_MAP_LINEAR, 0,