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Index: head/release/arm64/mkisoimages.sh
===================================================================
--- head/release/arm64/mkisoimages.sh
+++ head/release/arm64/mkisoimages.sh
@@ -0,0 +1,93 @@
+#!/bin/sh
+#
+# $FreeBSD$
+#
+# 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
+
+scriptdir=$(dirname $(realpath $0))
+. ${scriptdir}/../../tools/boot/install-boot.sh
+
+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="$4"
+
+ # Make an EFI system partition.
+ # The ISO file is a special case, in that it only has a maximum of
+ # 800 KB available for the boot code. So make an 800 KB ESP
+ espfilename=$(mktemp /tmp/efiboot.XXXXXX)
+ make_esp_file ${espfilename} 800 ${BASEBITSDIR}/boot/loader.efi
+
+ bootable="-o bootimage=efi;${espfilename} -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 ${espfilename}
+
+if [ "$bootable" != "" ]; then
+ # Look for the EFI System Partition image we dropped in the ISO image.
+ for entry in `$ETDUMP --format shell $NAME`; do
+ eval $entry
+ # XXX: etdump(8) returns "default" for the initial entry
+ if [ "$et_platform" = "default" ]; then
+ espstart=`expr $et_lba \* 2048`
+ espsize=`expr $et_sectors \* 512`
+ espparam="-p efi::$espsize:$espstart"
+ break
+ fi
+ done
+
+ # Create a GPT image containing the EFI partition.
+ imgsize=`stat -f %z "$NAME"`
+ $MKIMG -s gpt \
+ --capacity $imgsize \
+ $espparam \
+ -o efi.img
+
+ # Drop the GPT into the System Area of the ISO.
+ dd if=efi.img of="$NAME" bs=32k count=1 conv=notrunc
+ rm -f efi.img
+fi

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