Index: sys/dev/bge/if_bge.c
===================================================================
--- sys/dev/bge/if_bge.c	(revision 296253)
+++ sys/dev/bge/if_bge.c	(working copy)
@@ -4196,7 +4196,11 @@ bge_reset(struct bge_softc *sc)
 		CSR_WRITE_4(sc, BGE_MARB_MODE, BGE_MARBMODE_ENABLE);
 
 	/* Fix up byte swapping. */
-	CSR_WRITE_4(sc, BGE_MODE_CTL, bge_dma_swap_options(sc));
+	if (sc->bge_asf_mode & ASF_STACKUP)
+		CSR_WRITE_4(sc, BGE_MODE_CTL, bge_dma_swap_options(sc) |
+		    BGE_MODECTL_STACKUP);
+	else
+		CSR_WRITE_4(sc, BGE_MODE_CTL, bge_dma_swap_options(sc));
 
 	val = CSR_READ_4(sc, BGE_MAC_MODE);
 	val = (val & ~mac_mode_mask) | mac_mode;