diff --git a/sys/dev/alc/if_alc.c b/sys/dev/alc/if_alc.c
index 255fea53acfa..eb906d60bcbe 100644
--- a/sys/dev/alc/if_alc.c
+++ b/sys/dev/alc/if_alc.c
@@ -1438,6 +1438,8 @@ alc_attach(device_t dev)
 	case DEVICEID_ATHEROS_AR8151:
 	case DEVICEID_ATHEROS_AR8151_V2:
 		sc->alc_flags |= ALC_FLAG_APS;
+		if (CSR_READ_4(sc, ALC_MT_MAGIC) == MT_MAGIC)
+			sc->alc_flags |= ALC_FLAG_MT;
 		/* FALLTHROUGH */
 	default:
 		break;
@@ -1977,6 +1979,8 @@ alc_dma_alloc(struct alc_softc *sc)
 	int error, i;
 
 	lowaddr = BUS_SPACE_MAXADDR;
+	if (sc->alc_flags & ALC_FLAG_MT)
+		lowaddr = BUS_SPACE_MAXSIZE_32BIT;
 again:
 	/* Create parent DMA tag. */
 	error = bus_dma_tag_create(
@@ -2219,7 +2223,7 @@ alc_dma_alloc(struct alc_softc *sc)
 	error = bus_dma_tag_create(
 	    bus_get_dma_tag(sc->alc_dev), /* parent */
 	    1, 0,			/* alignment, boundary */
-	    BUS_SPACE_MAXADDR,		/* lowaddr */
+	    lowaddr,			/* lowaddr */
 	    BUS_SPACE_MAXADDR,		/* highaddr */
 	    NULL, NULL,			/* filter, filterarg */
 	    BUS_SPACE_MAXSIZE_32BIT,	/* maxsize */
@@ -3339,6 +3343,11 @@ alc_intr(void *arg)
 
 	sc = (struct alc_softc *)arg;
 
+	if (sc->alc_flags & ALC_FLAG_MT) {
+		taskqueue_enqueue(sc->alc_tq, &sc->alc_int_task);
+		return (FILTER_HANDLED);
+	}
+
 	status = CSR_READ_4(sc, ALC_INTR_STATUS);
 	if ((status & ALC_INTRS) == 0)
 		return (FILTER_STRAY);
@@ -3416,7 +3425,10 @@ alc_int_task(void *arg, int pending)
 done:
 	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0) {
 		/* Re-enable interrupts if we're running. */
-		CSR_WRITE_4(sc, ALC_INTR_STATUS, 0x7FFFFFFF);
+		if (sc->alc_flags & ALC_FLAG_MT)
+			CSR_WRITE_4(sc, ALC_INTR_STATUS, 0);
+		else
+			CSR_WRITE_4(sc, ALC_INTR_STATUS, 0x7FFFFFFF);
 	}
 	ALC_UNLOCK(sc);
 }
diff --git a/sys/dev/alc/if_alcreg.h b/sys/dev/alc/if_alcreg.h
index 3b4ee133b01a..7668f0960d9f 100644
--- a/sys/dev/alc/if_alcreg.h
+++ b/sys/dev/alc/if_alcreg.h
@@ -1121,6 +1121,14 @@
 #define	MII_EXT_ANEG_NLP78		0x8027
 #define	ANEG_NLP78_120M_DEFAULT		0x8A05
 
+#define ALC_MT_MAGIC			0x1F00
+#define ALC_MT_MODE			0x1F04
+#define ALC_MT_SPEED			0x1F08
+#define ALC_MT_VERSION			0x1F0C
+
+#define MT_MAGIC			0xaabb1234
+#define MT_MODE_4Q			BIT(0)
+
 /* Statistics counters collected by the MAC. */
 struct smb {
 	/* Rx stats. */
diff --git a/sys/dev/alc/if_alcvar.h b/sys/dev/alc/if_alcvar.h
index 8dea20196dae..926c80021858 100644
--- a/sys/dev/alc/if_alcvar.h
+++ b/sys/dev/alc/if_alcvar.h
@@ -239,6 +239,7 @@ struct alc_softc {
 #define	ALC_FLAG_LINK_WAR	0x4000
 #define	ALC_FLAG_E2X00		0x8000
 #define	ALC_FLAG_LINK		0x10000
+#define	ALC_FLAG_MT		0x20000
 
 	struct callout		alc_tick_ch;
 	struct alc_hw_stats	alc_stats;
@@ -284,6 +285,6 @@ do {									\
 #define	ALC_TX_TIMEOUT		5
 #define	ALC_RESET_TIMEOUT	100
 #define	ALC_TIMEOUT		1000
-#define	ALC_PHY_TIMEOUT		1000
+#define	ALC_PHY_TIMEOUT		10000
 
 #endif	/* _IF_ALCVAR_H */