DoorbellClrReg_p
sa_writew(dev, DoorbellClrReg_p, DOORBELL_0);
sa_writew(dev, DoorbellClrReg_p, DOORBELL_0);
sa_writew(dev, DoorbellClrReg_p, PrintfReady); /* clear PrintfReady */
sa_writew(dev, DoorbellClrReg_p, DOORBELL_1);
sa_writew(dev, DoorbellClrReg_p, DOORBELL_2);
sa_writew(dev, DoorbellClrReg_p, DOORBELL_3);
sa_writew(dev, DoorbellClrReg_p, DOORBELL_4);