diff --git a/sys/arm64/arm64/bus_machdep.c b/sys/arm64/arm64/bus_machdep.c
index bce20f8eb6d4..341b9db018d0 100644
--- a/sys/arm64/arm64/bus_machdep.c
+++ b/sys/arm64/arm64/bus_machdep.c
@@ -39,6 +39,9 @@ __FBSDID("$FreeBSD$");
 
 #include <machine/bus.h>
 
+#include <sys/types.h>
+#include <sys/systm.h>
+
 uint8_t  generic_bs_r_1(void *, bus_space_handle_t, bus_size_t);
 uint16_t generic_bs_r_2(void *, bus_space_handle_t, bus_size_t);
 uint32_t generic_bs_r_4(void *, bus_space_handle_t, bus_size_t);
@@ -105,6 +108,8 @@ generic_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags,
 	ma = VM_MEMATTR_DEVICE;
 	if (flags == BUS_SPACE_MAP_NONPOSTED)
 		ma = VM_MEMATTR_DEVICE_NP;
+	else if (flags == BUS_SPACE_MAP_POSTED)
+		ma = VM_MEMATTR_DEVICE_nGnRE;
 	va = pmap_mapdev_attr(bpa, size, ma);
 	if (va == NULL)
 		return (ENOMEM);
diff --git a/sys/arm64/arm64/nexus.c b/sys/arm64/arm64/nexus.c
index 52bf832c02d7..1f35a8682c79 100644
--- a/sys/arm64/arm64/nexus.c
+++ b/sys/arm64/arm64/nexus.c
@@ -364,6 +364,9 @@ nexus_activate_resource_flags(device_t bus, device_t child, int type, int rid,
 			resource_init_map_request(&args);
 			if ((flags & BUS_SPACE_MAP_NONPOSTED) != 0)
 				args.memattr = VM_MEMATTR_DEVICE_NP;
+			else if ((flags & BUS_SPACE_MAP_POSTED) != 0) {
+				args.memattr = VM_MEMATTR_DEVICE_nGnRE;
+			}
 			err = nexus_map_resource(bus, child, type, r, &args,
 			    &map);
 			if (err != 0) {
@@ -546,6 +549,11 @@ nexus_fdt_activate_resource(device_t bus, device_t child, int type, int rid,
 				flags |= BUS_SPACE_MAP_NONPOSTED;
 			}
 		}
+
+		devclass_t pci_class = devclass_find("bge");
+		if (device_get_devclass(child) == pci_class) {
+			flags |= BUS_SPACE_MAP_POSTED;
+		}
 		break;
 	default:
 		break;
diff --git a/sys/arm64/include/bus.h b/sys/arm64/include/bus.h
index 902be0db3b62..bb469c417756 100644
--- a/sys/arm64/include/bus.h
+++ b/sys/arm64/include/bus.h
@@ -86,6 +86,7 @@
 #define	BUS_SPACE_MAP_LINEAR		0x02
 #define	BUS_SPACE_MAP_PREFETCHABLE	0x04
 #define	BUS_SPACE_MAP_NONPOSTED		0x08
+#define	BUS_SPACE_MAP_POSTED		0x10
 
 #define	BUS_SPACE_UNRESTRICTED	(~0)