Index: head/etc/mtree/BSD.root.dist
===================================================================
--- head/etc/mtree/BSD.root.dist
+++ head/etc/mtree/BSD.root.dist
@@ -18,6 +18,8 @@
         ..
         modules
         ..
+        overlays
+        ..
         zfs
         ..
     ..
Index: head/share/man/man7/hier.7
===================================================================
--- head/share/man/man7/hier.7
+++ head/share/man/man7/hier.7
@@ -28,7 +28,7 @@
 .\"	@(#)hier.7	8.1 (Berkeley) 6/5/93
 .\" $FreeBSD$
 .\"
-.Dd December 3, 2017
+.Dd January 15, 2018
 .Dt HIER 7
 .Os
 .Sh NAME
@@ -63,6 +63,11 @@
 third-party loadable kernel modules;
 see
 .Xr kldstat 8
+.It Pa overlays/
+Compiled flattened device tree (FDT) overlays; see
+.Xr fdt 4
+and
+.Xr dtc 1
 .It Pa zfs/
 .Xr zfs 8
 zpool cache files
Index: head/stand/arm/loader/loader.conf
===================================================================
--- head/stand/arm/loader/loader.conf
+++ head/stand/arm/loader/loader.conf
@@ -7,7 +7,7 @@
 bootfile="kernel"      # Kernel name (possibly absolute path)
 kernel="kernel"        # /boot sub-directory containing kernel and modules
 loader_conf_files="/boot/loader.conf /boot/loader.conf.local"
-module_path="/boot/kernel;/boot/modules;/boot/dtb"
+module_path="/boot/kernel;/boot/modules;/boot/dtb;/boot/overlays"
 nextboot_conf="/boot/nextboot.conf"
 nextboot_enable="NO"
 verbose_loading="NO"
Index: head/stand/forth/loader.conf
===================================================================
--- head/stand/forth/loader.conf
+++ head/stand/forth/loader.conf
@@ -97,7 +97,7 @@
 #comconsole_speed="9600"	# Set the current serial console speed
 #console="vidconsole"		# A comma separated list of console(s)
 #currdev="disk1s1a"		# Set the current device
-module_path="/boot/modules;/boot/dtb"	# Set the module search path
+module_path="/boot/modules;/boot/dtb;/boot/overlays"	# Set the module search path
 #prompt="\\${interpret}"	# Set the command prompt
 #root_disk_unit="0"		# Force the root disk unit number
 #rootdev="disk1s1a"		# Set the root filesystem
Index: head/stand/mips/uboot/loader.conf
===================================================================
--- head/stand/mips/uboot/loader.conf
+++ head/stand/mips/uboot/loader.conf
@@ -7,7 +7,7 @@
 bootfile="kernel"      # Kernel name (possibly absolute path)
 kernel="kernel"        # /boot sub-directory containing kernel and modules
 loader_conf_files="/boot/loader.conf /boot/loader.conf.local"
-module_path="/boot/kernel;/boot/modules;/boot/dtb"
+module_path="/boot/kernel;/boot/modules;/boot/dtb;/boot/overlays"
 nextboot_conf="/boot/nextboot.conf"
 nextboot_enable="NO"
 verbose_loading="NO"