CISS_I2O_INBOUND_DOORBELL
uint32_t idr = smrt_get32(smrt, CISS_I2O_INBOUND_DOORBELL);
smrt_put32(smrt, CISS_I2O_INBOUND_DOORBELL, idr);
idr = smrt_get32(smrt, CISS_I2O_INBOUND_DOORBELL);