diff --git a/sys/bus/cam/cam_xpt.c b/sys/bus/cam/cam_xpt.c
index fae2c8b9a0..ec4921bf7a 100644
--- a/sys/bus/cam/cam_xpt.c
+++ b/sys/bus/cam/cam_xpt.c
@@ -6389,7 +6389,7 @@ probedone(struct cam_periph *periph, union ccb *done_ccb)
 		 */
 		if (softc->action == PROBE_TUR_FOR_NEGOTIATION
 		 && done_ccb->ccb_h.target_lun == 0
-		 && (path->device->inq_data.flags & SID_Sync) != 0
+/*		 && (path->device->inq_data.flags & SID_Sync) != 0 */
                  && (path->device->flags & CAM_DEV_IN_DV) == 0) {
 			CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
 			    ("Begin Domain Validation\n"));
@@ -6421,6 +6421,8 @@ probedone(struct cam_periph *periph, union ccb *done_ccb)
 		struct ccb_scsiio *csio;
 
 		if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
+			CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
+			    ("PROBE_INQUIRY_BASIC_DV2: CAM_DEV_QFRZN\n"));
 			/* Don't wedge the queue */
 			xpt_release_devq(done_ccb->ccb_h.path, /*count*/1,
 					 /*run_queue*/TRUE);
@@ -6432,10 +6434,14 @@ probedone(struct cam_periph *periph, union ccb *done_ccb)
 			    "inquiry data fails comparison at DV%d step\n",
 			    softc->action == PROBE_INQUIRY_BASIC_DV1 ? 1 : 2);
 			if (proberequestbackoff(periph, path->device)) {
+				CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
+				    ("PROBE_INQUIRY_BASIC_DV2: setting action PROBE_TUR_FOR_NEGOTIATION\n"));
 				path->device->flags &= ~CAM_DEV_IN_DV;
 				PROBE_SET_ACTION(softc, PROBE_TUR_FOR_NEGOTIATION);
 			} else {
 				/* give up */
+				CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
+				    ("PROBE_INQUIRY_BASIC_DV2: setting action PROBE_DV_EXIT\n"));
 				PROBE_SET_ACTION(softc, PROBE_DV_EXIT);
 			}
 			kfree(nbuf, M_CAMXPT);
@@ -6445,6 +6451,8 @@ probedone(struct cam_periph *periph, union ccb *done_ccb)
 		}
 		kfree(nbuf, M_CAMXPT);
 		if (softc->action == PROBE_INQUIRY_BASIC_DV1) {
+			CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
+			    ("PROBE_INQUIRY_BASIC_DV2: setting action PROBE_INQUIRY_BASIC_DV2\n"));
 			PROBE_SET_ACTION(softc, PROBE_INQUIRY_BASIC_DV2);
 			xpt_release_ccb(done_ccb);
 			xpt_schedule(periph, priority);
@@ -6458,6 +6466,8 @@ probedone(struct cam_periph *periph, union ccb *done_ccb)
 		    ~(CAM_DEV_UNCONFIGURED|CAM_DEV_IN_DV|CAM_DEV_DV_HIT_BOTTOM);
 		if ((softc->flags & PROBE_NO_ANNOUNCE) == 0) {
 			/* Inform the XPT that a new device has been found */
+			CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
+			    ("PROBE_INQUIRY_BASIC_DV2: Announce new device has been found\n"));
 			done_ccb->ccb_h.func_code = XPT_GDEV_TYPE;
 			xpt_action(done_ccb);
 			xpt_async(AC_FOUND_DEVICE, done_ccb->ccb_h.path,
@@ -7143,6 +7153,7 @@ xpt_finishconfig_task(void *context, int pending)
 		/* XXX This will have to change when we have loadable modules */
 		p_drv = periph_drivers;
 		for (i = 0; p_drv[i] != NULL; i++) {
+			kprintf("%s: DEVICE DRIVER %s\n", __func__, p_drv[i]->driver_name);
 			(*p_drv[i]->init)();
 		}
 
diff --git a/sys/bus/cam/scsi/scsi_da.c b/sys/bus/cam/scsi/scsi_da.c
index e8d0d98e63..f0b6847534 100644
--- a/sys/bus/cam/scsi/scsi_da.c
+++ b/sys/bus/cam/scsi/scsi_da.c
@@ -836,6 +836,8 @@ dainit(void)
 {
 	cam_status status;
 
+	kprintf("%s: ENTER\n", __func__);
+
 	/*
 	 * Create our extend array for storing the devices we attach to.
 	 */
@@ -937,6 +939,8 @@ daasync(void *callback_arg, u_int32_t code,
 {
 	struct cam_periph *periph;
 
+	kprintf("%s: ENTER\n", __func__);
+
 	periph = (struct cam_periph *)callback_arg;
 
 	switch (code) {
@@ -944,7 +948,9 @@ daasync(void *callback_arg, u_int32_t code,
 	{
 		struct ccb_getdev *cgd;
 		cam_status status;
- 
+
+		kprintf("%s: AC_FOUND_DEVICE\n", __func__);
+
 		cgd = (struct ccb_getdev *)arg;
 		if (cgd == NULL)
 			break;
@@ -984,6 +990,7 @@ daasync(void *callback_arg, u_int32_t code,
 		struct da_softc *softc;
 		struct ccb_hdr *ccbh;
 
+		kprintf("%s: AC_BUS_RESET AC_SENT_BDR\n", __func__);
 		softc = (struct da_softc *)periph->softc;
 		/*
 		 * Don't fail on the expected unit attention
@@ -994,10 +1001,12 @@ daasync(void *callback_arg, u_int32_t code,
 			ccbh->ccb_state |= DA_CCB_RETRY_UA;
 		/* FALLTHROUGH*/
 	}
-	default:
+	default: {
+		kprintf("%s: default\n", __func__);
 		cam_periph_async(periph, code, path, arg);
 		break;
 	}
+	}
 }
 
 static void
diff --git a/sys/bus/cam/scsi/scsi_pass.c b/sys/bus/cam/scsi/scsi_pass.c
index 5bb6b5702e..8c0545523b 100644
--- a/sys/bus/cam/scsi/scsi_pass.c
+++ b/sys/bus/cam/scsi/scsi_pass.c
@@ -121,6 +121,7 @@ static void
 passinit(void)
 {
 	cam_status status;
+	kprintf("%s: ENTER\n", __func__);
 
 	/*
 	 * Create our extend array for storing the devices we attach to.
@@ -190,12 +191,16 @@ passasync(void *callback_arg, u_int32_t code,
 
 	periph = (struct cam_periph *)callback_arg;
 
+	kprintf("%s: ENTER\n", __func__);
+
 	switch (code) {
 	case AC_FOUND_DEVICE:
 	{
 		struct ccb_getdev *cgd;
 		cam_status status;
- 
+
+		kprintf("%s: AC_FOUND_DEVICE\n", __func__);
+
 		cgd = (struct ccb_getdev *)arg;
 		if (cgd == NULL)
 			break;
@@ -230,9 +235,12 @@ passasync(void *callback_arg, u_int32_t code,
 		break;
 	}
 	default:
+	{
+		kprintf("%s: default\n", __func__);
 		cam_periph_async(periph, code, path, arg);
 		break;
 	}
+	}
 }
 
 static cam_status
diff --git a/sys/bus/cam/scsi/scsi_sg.c b/sys/bus/cam/scsi/scsi_sg.c
index 313f7f975a..cf895438f1 100644
--- a/sys/bus/cam/scsi/scsi_sg.c
+++ b/sys/bus/cam/scsi/scsi_sg.c
@@ -152,6 +152,7 @@ sginit(void)
 {
 	cam_status status;
 
+	kprintf("%s: ENTER\n", __func__);
 	/*
 	 * Install a global async callback.  This callback will receive aync
 	 * callbacks like "new device found".
@@ -211,12 +212,16 @@ sgasync(void *callback_arg, uint32_t code, struct cam_path *path, void *arg)
 
 	periph = (struct cam_periph *)callback_arg;
 
+	kprintf("%s: ENTER\n", __func__);
+
 	switch (code) {
 	case AC_FOUND_DEVICE:
 	{
 		struct ccb_getdev *cgd;
 		cam_status status;
 
+		kprintf("%s: AC_FOUND_DEVICE\n", __func__);
+
 		cgd = (struct ccb_getdev *)arg;
 		if (cgd == NULL)
 			break;
@@ -245,9 +250,12 @@ sgasync(void *callback_arg, uint32_t code, struct cam_path *path, void *arg)
 		break;
 	}
 	default:
+	{
+		kprintf("%s: default\n", __func__);
 		cam_periph_async(periph, code, path, arg);
 		break;
 	}
+	}
 }
 
 static cam_status
