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diff --git a/release/amd64/mkisoimages.sh b/release/amd64/mkisoimages.sh
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+#!/bin/sh
+#
+# Module: mkisoimages.sh
+# Author: Jordan K Hubbard
+# Date:   22 June 2001
+#
+# $FreeBSD$
+#
+# This script is used by release/Makefile to build the (optional) ISO images
+# for a FreeBSD release.  It is considered architecture dependent since each
+# platform has a slightly unique way of making bootable CDs.  This script
+# is also allowed to generate any number of images since that is more of
+# publishing decision than anything else.
+#
+# Usage:
+#
+# mkisoimages.sh [-b] image-label image-name base-bits-dir [extra-bits-dir]
+#
+# Where -b is passed if the ISO image should be made "bootable" by
+# whatever standards this architecture supports (may be unsupported),
+# image-label is the ISO image label, image-name is the filename of the
+# resulting ISO image, base-bits-dir contains the image contents and
+# extra-bits-dir, if provided, contains additional files to be merged
+# into base-bits-dir as part of making the image.
+
+set -e
+
+if [ -z $ETDUMP ]; then
+	ETDUMP=etdump
+fi
+
+if [ -z $MAKEFS ]; then
+	MAKEFS=makefs
+fi
+
+if [ -z $MKIMG ]; then
+	MKIMG=mkimg
+fi
+
+if [ "$1" = "-b" ]; then
+	BASEBITSDIR="$4"
+	# This is highly x86-centric and will be used directly below.
+	bootable="-o bootimage=i386;$BASEBITSDIR/boot/cdboot -o no-emul-boot"
+
+	# Make EFI system partition (should be done with makefs in the future)
+	dd if=/dev/zero of=efiboot.img bs=4k count=200
+	device=`mdconfig -a -t vnode -f efiboot.img`
+	newfs_msdos -F 12 -m 0xf8 /dev/$device
+	mkdir efi
+	mount -t msdosfs /dev/$device efi
+	mkdir -p efi/efi/boot
+	cp -p "$BASEBITSDIR/boot/loader.efi" efi/efi/boot/bootx64.efi
+	umount efi
+	rmdir efi
+	mdconfig -d -u $device
+	bootable="$bootable -o bootimage=i386;efiboot.img -o no-emul-boot -o platformid=efi"
+	
+	shift
+else
+	BASEBITSDIR="$3"
+	bootable=""
+fi
+
+if [ $# -lt 3 ]; then
+	echo "Usage: $0 [-b] image-label image-name base-bits-dir [extra-bits-dir]"
+	exit 1
+fi
+
+LABEL=`echo "$1" | tr '[:lower:]' '[:upper:]'`; shift
+NAME="$1"; shift
+
+publisher="The FreeBSD Project.  https://www.FreeBSD.org/"
+echo "/dev/iso9660/$LABEL / cd9660 ro 0 0" > "$BASEBITSDIR/etc/fstab"
+$MAKEFS -t cd9660 $bootable -o rockridge -o label="$LABEL" -o publisher="$publisher" "$NAME" "$@"
+rm -f "$BASEBITSDIR/etc/fstab"
+rm -f efiboot.img
+
+if [ "$bootable" != "" ]; then
+	# Look for the EFI System Partition image we dropped in the ISO image.
+	for entry in `$ETDUMP --format shell $NAME`; do
+		eval $entry
+		if [ "$et_platform" = "efi" ]; then
+			espstart=`expr $et_lba \* 2048`
+			espsize=`expr $et_sectors \* 512`
+			espparam="-p efi::$espsize:$espstart"
+			break
+		fi
+	done
+
+	# Create a GPT image containing the partitions we need for hybrid boot.
+	imgsize=`stat -f %z "$NAME"`
+	$MKIMG -s gpt \
+	    --capacity $imgsize \
+	    -b "$BASEBITSDIR/boot/pmbr" \
+	    $espparam \
+	    -p freebsd-boot:="$BASEBITSDIR/boot/isoboot" \
+	    -o hybrid.img
+
+	# Drop the PMBR, GPT, and boot code into the System Area of the ISO.
+	dd if=hybrid.img of="$NAME" bs=32k count=1 conv=notrunc
+	rm -f hybrid.img
+fi