Add a separate script to build the memstick.img and the

mini-memstick.img with UEFI support.

As the comments in the file suggest, 1) there must
be existing ${.OBJDIR}/usr/src/release/{release,bootonly};
2) TARGET/TARGET_ARCH must be amd64; and 3) it must be
a vt(4)-enabled kernel with vt_efifb (*not* vt_vga).

This script is not hooked into release/Makefile in any way
until further testing is complete.

Sponsored by:	The FreeBSD Foundation

release/amd64/make-uefi-memstick.sh

@@ -0,0 +1,73 @@
+#!/bin/sh
+#
+# This script generates a "memstick image" for UEFI-capable systems.
+#
+# Prerequisites:
+#  - 'make release'
+#  - KERNCONF *must* be VT (or vt_efifb(4) compiled into the kernel)
+#
+# Note:  This only works for amd64, because i386 lacks the EFI boot bits.
+#
+# Usage: make-memstick.sh <directory tree> <image filename>
+#
+# $FreeBSD$
+#
+
+PATH=/bin:/usr/bin:/sbin:/usr/sbin
+export PATH
+
+if [ $# -ne 2 ]; then
+	echo "make-memstick.sh /path/to/directory /path/to/image/file"
+	exit 1
+fi
+
+if [ ! -d ${1} ]; then
+	echo "${1} must be a directory"
+	exit 1
+fi
+
+if [ -e ${2} ]; then
+	echo "won't overwrite ${2}"
+	exit 1
+fi
+
+dirsize=$(du -shLm ${1} | awk '{print $1}')
+dirsize=$(( $(( $(( ${dirsize} + 256 )) * 1024 * 1024 )) ))
+truncate -s ${dirsize} ${2}
+
+unit=$(mdconfig -a -t vnode -f ${2})
+gpart create -s mbr /dev/${unit}
+gpart add -t '!0xEF' -s 32M /dev/${unit}
+gpart add -t freebsd /dev/${unit}
+gpart set -a active -i 2 /dev/${unit}
+gpart bootcode -b ${1}/boot/boot0 /dev/${unit}
+gpart create -s bsd -n 20 /dev/${unit}s2
+gpart add -t freebsd-ufs /dev/${unit}s2
+gpart bootcode -b ${1}/boot/boot /dev/${unit}s2
+newfs_msdos /dev/${unit}s1
+newfs -L rootfs /dev/${unit}s2a
+mkdir -p ${1}/mnt
+mount -t msdosfs /dev/${unit}s1 ${1}/mnt
+mkdir -p ${1}/mnt/efi/boot
+cp -p ${1}/boot/boot1.efi ${1}/mnt/efi/boot/BOOTx64.efi
+
+while ! umount ${1}/mnt; do
+	sleep 1
+done
+
+mkdir -p mnt
+mount /dev/${unit}s2a mnt
+tar -cf - -C ${1} . | tar -xf - -C mnt
+echo "/dev/ufs/rootfs / ufs ro,noatime 1 1" > mnt/etc/fstab
+
+while ! umount mnt; do
+	sleep 1
+done
+
+# Default boot selection to MBR so systems that do not support UEFI
+# do not fail to boot without human interaction.
+boot0cfg -s 2 /dev/${unit}
+
+mdconfig -d -u ${unit}
+rmdir mnt
+