Index: ncr53c9x.c
===================================================================
RCS file: /cvsroot/src/sys/dev/ic/ncr53c9x.c,v
retrieving revision 1.146
diff -p -u -r1.146 ncr53c9x.c
--- ncr53c9x.c	24 Dec 2016 06:04:50 -0000	1.146
+++ ncr53c9x.c	5 Jan 2017 07:25:16 -0000
@@ -1150,6 +1150,7 @@ ncr53c9x_sched(struct ncr53c9x_softc *sc
 			TAILQ_REMOVE(&sc->ready_list, ecb, chain);
 			ecb->flags &= ~ECB_READY;
 			sc->sc_nexus = ecb;
+printf("+%p:UN\n",ecb);
 			ncr53c9x_select(sc, ecb);
 			break;
 		}
@@ -1157,6 +1158,7 @@ ncr53c9x_sched(struct ncr53c9x_softc *sc
 			TAILQ_REMOVE(&sc->ready_list, ecb, chain);
 			ecb->flags &= ~ECB_READY;
 			sc->sc_nexus = ecb;
+printf("+%p:%02x\n",ecb,ecb->tag[1]);
 			ncr53c9x_select(sc, ecb);
 			break;
 		} else {
@@ -1196,6 +1198,7 @@ ncr53c9x_sense(struct ncr53c9x_softc *sc
 	li->untagged = ecb; /* must be executed first to fix C/A */
 	li->busy = 2;
 	if (ecb == sc->sc_nexus) {
+printf("+%p:RS\n",ecb);
 		ncr53c9x_select(sc, ecb);
 	} else {
 		TAILQ_INSERT_HEAD(&sc->ready_list, ecb, chain);
@@ -1304,10 +1307,12 @@ ncr53c9x_dequeue(struct ncr53c9x_softc *
 		    __func__, lun, ecb);
 #endif
 	if (li->untagged == ecb) {
+printf("-%p:UN\n",ecb);
 		li->busy = 0;
 		li->untagged = NULL;
 	}
 	if (ecb->tag[0] && li->queued[ecb->tag[1]] != NULL) {
+printf("-%p:%02x\n",ecb,ecb->tag[1]);
 #ifdef DIAGNOSTIC
 		if (li->queued[ecb->tag[1]] != NULL &&
 		    (li->queued[ecb->tag[1]] != ecb))