diff --git a/sys/powerpc/include/resource.h b/sys/powerpc/include/resource.h
--- a/sys/powerpc/include/resource.h
+++ b/sys/powerpc/include/resource.h
@@ -41,4 +41,11 @@
 #define	SYS_RES_IOPORT	4	/* i/o ports */
 #define	PCI_RES_BUS	5	/* PCI bus numbers */
 
+/*
+ * A powerpc-specific resource flag to request little-endian bus tags
+ * for a resource.
+ */
+
+#define	RF_LITTLEENDIAN		RF_SPARE1
+
 #endif /* !_MACHINE_RESOURCE_H_ */
diff --git a/sys/powerpc/mpc85xx/fsl_sata.c b/sys/powerpc/mpc85xx/fsl_sata.c
--- a/sys/powerpc/mpc85xx/fsl_sata.c
+++ b/sys/powerpc/mpc85xx/fsl_sata.c
@@ -352,9 +352,8 @@
 	}
 	ch->r_mid = 0;
 	if (!(ch->r_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
-	    &ch->r_mid, RF_ACTIVE)))
+	    &ch->r_mid, RF_ACTIVE | RF_LITTLEENDIAN)))
 		return (ENXIO);
-	rman_set_bustag(ch->r_mem, &bs_le_tag);
 	fsl_sata_dmainit(dev);
 	fsl_sata_slotsalloc(dev);
 	fsl_sata_init(dev);
diff --git a/sys/powerpc/powerpc/nexus.c b/sys/powerpc/powerpc/nexus.c
--- a/sys/powerpc/powerpc/nexus.c
+++ b/sys/powerpc/powerpc/nexus.c
@@ -275,14 +275,20 @@
 		panic("%s:%d SYS_RES_IOPORT handling not implemented", __func__, __LINE__);
 		/*   XXX: untested
 		map->r_bushandle = start;
-		map->r_bustag = nexus_get_bus_tag(NULL, NULL);
+		if ((rman_get_flags(r) & RF_LITTLEENDIAN) != 0)
+			map->r_bustag = &bs_le_tag;
+		else
+			map->r_bustag = nexus_get_bus_tag(NULL, NULL);
 		map->r_size = length;
 		map->r_vaddr = NULL;
 		*/
 		break;
 	case SYS_RES_MEMORY:
 		map->r_vaddr = pmap_mapdev_attr(start, length, args.memattr);
-		map->r_bustag = nexus_get_bus_tag(NULL, NULL);
+		if ((rman_get_flags(r) & RF_LITTLEENDIAN) != 0)
+			map->r_bustag = &bs_le_tag;
+		else
+			map->r_bustag = nexus_get_bus_tag(NULL, NULL);
 		map->r_size = length;
 		map->r_bushandle = (bus_space_handle_t)map->r_vaddr;
 		break;