Index: gem.c
===================================================================
RCS file: /cvs/src/sys/dev/ic/gem.c,v
retrieving revision 1.121
diff -u -p -r1.121 gem.c
--- gem.c	22 Jan 2017 10:17:38 -0000	1.121
+++ gem.c	9 May 2017 08:04:45 -0000
@@ -161,7 +161,8 @@ gem_config(struct gem_softc *sc)
 
 	if ((error = bus_dmamap_create(sc->sc_dmatag,
 	    sizeof(struct gem_control_data), 1,
-	    sizeof(struct gem_control_data), 0, 0, &sc->sc_cddmamap)) != 0) {
+	    sizeof(struct gem_control_data), 0, BUS_DMA_64BIT,
+	    &sc->sc_cddmamap)) != 0) {
 		printf("\n%s: unable to create control data DMA map, "
 		    "error = %d\n", sc->sc_dev.dv_xname, error);
 		goto fail_2;
@@ -180,7 +181,8 @@ gem_config(struct gem_softc *sc)
 	 */
 	for (i = 0; i < GEM_NRXDESC; i++) {
 		if ((error = bus_dmamap_create(sc->sc_dmatag, MCLBYTES, 1,
-		    MCLBYTES, 0, 0, &sc->sc_rxsoft[i].rxs_dmamap)) != 0) {
+		    MCLBYTES, 0, BUS_DMA_64BIT,
+		    &sc->sc_rxsoft[i].rxs_dmamap)) != 0) {
 			printf("\n%s: unable to create rx DMA map %d, "
 			    "error = %d\n", sc->sc_dev.dv_xname, i, error);
 			goto fail_5;
@@ -192,7 +194,7 @@ gem_config(struct gem_softc *sc)
 	 */
 	for (i = 0; i < GEM_NTXDESC; i++) {
 		if ((error = bus_dmamap_create(sc->sc_dmatag, MCLBYTES,
-		    GEM_NTXSEGS, MCLBYTES, 0, BUS_DMA_NOWAIT,
+		    GEM_NTXSEGS, MCLBYTES, 0, BUS_DMA_NOWAIT | BUS_DMA_64BIT,
 		    &sc->sc_txd[i].sd_map)) != 0) {
 			printf("\n%s: unable to create tx DMA map %d, "
 			    "error = %d\n", sc->sc_dev.dv_xname, i, error);