Index: sys/external/bsd/dwc2/dist/dwc2_core.c
===================================================================
RCS file: /cvsroot/src/sys/external/bsd/dwc2/dist/dwc2_core.c,v
retrieving revision 1.9
diff -u -p -r1.9 dwc2_core.c
--- sys/external/bsd/dwc2/dist/dwc2_core.c	1 Sep 2015 06:24:21 -0000	1.9
+++ sys/external/bsd/dwc2/dist/dwc2_core.c	1 Sep 2015 12:45:08 -0000
@@ -686,12 +686,22 @@ static int dwc2_phy_init(struct dwc2_hso
 
 static int dwc2_gahbcfg_init(struct dwc2_hsotg *hsotg)
 {
+	struct dwc2_softc *sc = hsotg->hsotg_sc;
 	u32 ahbcfg = DWC2_READ_4(hsotg, GAHBCFG);
 
 	switch (hsotg->hw_params.arch) {
 	case GHWCFG2_EXT_DMA_ARCH:
-		dev_err(hsotg->dev, "External DMA Mode not supported\n");
-		return -EINVAL;
+		dev_dbg(hsotg->dev, "External DMA Mode\n");
+		if (!sc->sc_set_dma_addr) {
+			dev_err(hsotg->dev, "External DMA Mode not supported\n");
+			return -EINVAL;
+		}
+		if (hsotg->core_params->ahbcfg != -1) {
+			ahbcfg &= GAHBCFG_CTRL_MASK;
+			ahbcfg |= hsotg->core_params->ahbcfg &
+				  ~GAHBCFG_CTRL_MASK;
+		}
+		break;
 
 	case GHWCFG2_INT_DMA_ARCH:
 		dev_dbg(hsotg->dev, "Internal DMA Mode\n");