Boot-to-ramdisk image generation scripts

Scripts for generating boot-to-ramdisk images are now available. These
can be used for example to boot from PXE or from a USB stick, as the
ramdisk are self-contained and do not rely on any block devices after
being loaded into RAM.

The image generation framework has also been slightly cleaned up in
order to better accomodate tarball sets bundling in images.

Change-Id: I65a176832bd0d6954b430fa8305f90af0bd606c1

etc/rc

@@ -1,5 +1,10 @@
 # /etc/rc - System startup script run by init before going multiuser.
 
+if sysenv bootramdisk >/dev/null
+then
+	/bin/sh /etc/rc.ramdisk
+fi
+
 # Are we booting from CD?
 bootcd="`/bin/sysenv bootcd`"
 
@@ -138,9 +143,12 @@ autoboot|start)
     fsck -x / $fflag $fsckopts
     mount -a
 
+    if [ -z "`sysenv bootramdisk`" ]
+    then
 	# Unmount and free now defunct ramdisk
 	umount /dev/imgrd > /dev/null || echo "Failed to unmount boot ramdisk"
 	ramdisk 0 /dev/imgrd || echo "Failed to free boot ramdisk"
+    fi
 
     # Initialize files.
     >/var/run/utmp				# /etc/utmp keeps track of logins

minix/drivers/storage/ramdisk/rc

@@ -55,7 +55,7 @@ fi
 if /bin/sysenv rootdevname >/dev/null
 then	rootdevname=/dev/`/bin/sysenv rootdevname`
 else
-	if ! sysenv cdproberoot >/dev/null
+	if (! sysenv cdproberoot) && (! sysenv bootramdisk) >/dev/null
 	then	echo "rootdevname not set"
 		exit 1
 	fi
@@ -81,6 +81,11 @@ then
 	loadramdisk "$ramimagename" || echo "WARNING: loadramdisk failed"
 fi
 
+if sysenv bootramdisk >/dev/null
+then
+	rootdevname=imgrd
+fi
+
 echo "Root device name is $rootdevname"
 
 if ! sysenv cdproberoot >/dev/null
@@ -92,8 +97,14 @@ fi
 
 # Change root from temporary boot ramdisk to the configure
 # root device
-/bin/mount -n $bin_img"$rootdevname" /
+if ! sysenv bootramdisk >/dev/null
+then
+	/bin/mount -n $bin_img"$rootdevname" /
+fi
 
 /bin/mount -e -n -t procfs none /proc || echo "WARNING: couldn't mount procfs"
 
-exec /bin/sh /etc/rc `sysenv bootopts` "$@"
+if ! sysenv bootramdisk >/dev/null
+then
+	exec /bin/sh /etc/rc `sysenv bootopts` "$@"
+fi

releasetools/image.defaults

@@ -16,5 +16,10 @@
 : ${PKG_INFO=pkg_info}
 : ${BUNDLE_PACKAGES=}
 
+: ${BUNDLE_SETS=0}
+
 : ${RC=../local/rc.${ARCH}}
 : ${ASR_HACK=0}
+
+# where the kernel & boot modules will be
+MODDIR=${DESTDIR}/boot/minix/.temp

releasetools/image.functions

@@ -8,7 +8,8 @@
 #
 # $1 : directory to add
 # $2 : spec file
-add_dir_spec() {
+add_dir_spec()
+{
 	echo "./$1 type=dir uid=0 gid=0 mode=0755" >> ${WORK_DIR}/$2
 }
 
@@ -17,7 +18,8 @@ add_dir_spec() {
 #
 # $1 : file to add
 # $2 : spec file
-add_file_spec() {
+add_file_spec()
+{
 	echo "./$1 type=file uid=0 gid=0 mode=0755 size=$(wc -c < ${ROOT_DIR}/${1})" >> ${WORK_DIR}/$2
 }
 
@@ -27,7 +29,8 @@ add_file_spec() {
 # $1 : symlink to add
 # $2 : link to
 # $3 : spec file
-add_link_spec() {
+add_link_spec()
+{
 	echo "./$1 type=link uid=0 gid=0 mode=0755 link=$2" >> ${WORK_DIR}/$3
 }
 
@@ -40,7 +43,8 @@ add_link_spec() {
 # spec files are put in WORK_DIR, the file system created in ROOT_DIR
 #
 # $1 : sets to extract
-build_workdir() {
+build_workdir()
+{
 	# Extract sets
 	mkdir -p ${ROOT_DIR}
 	for set in $1; do
@@ -64,19 +68,28 @@ build_workdir() {
 	# Build specifications files
 	cp ${ROOT_DIR}/etc/mtree/set* ${WORK_DIR}
 	${ROOT_DIR}/usr/bin/MAKEDEV -s -m all >> ${WORK_DIR}/extra.dev
+
+	if [ ${BUNDLE_SETS} -eq 1 ]
+	then
+		echo " * Bundling sets..."
+		workdir_add_sets
+	fi
 }
 
 #
 # Add tarball sets to the workdir (for installation CD)
 #
-workdir_add_sets() {
+workdir_add_sets()
+{
 	# Add sets to the root
-	mkdir -p ${ROOT_DIR}/${ARCH}/binary/sets;
+	mkdir -p ${ROOT_DIR}/usr/${ARCH}/binary/sets;
-	add_dir_spec "${ARCH}" extra.sets
+	add_dir_spec "usr/${ARCH}" extra.sets
-	add_dir_spec "${ARCH}/binary" extra.sets
+	add_dir_spec "usr/${ARCH}/binary" extra.sets
-	add_dir_spec "${ARCH}/binary/sets" extra.sets
+	add_dir_spec "usr/${ARCH}/binary/sets" extra.sets
 
-	DEST_SETS_DIR="${ARCH}/binary/sets"
+	add_link_spec "${ARCH}" "usr/${ARCH}" extra.sets
+
+	DEST_SETS_DIR="usr/${ARCH}/binary/sets"
 	for set in ${SETS_DIR}/*.tgz; do
 		# Copy set itself
 		cp ${set} ${ROOT_DIR}/${DEST_SETS_DIR}
@@ -107,10 +120,37 @@ workdir_add_sets() {
 	add_file_spec "${DEST_SETS_DIR}/SHA512" extra.sets
 }
 
+#
+# Add HDD files to the workdir
+#
+workdir_add_hdd_files()
+{
+	# create a fstab entry in /etc
+	cat >${ROOT_DIR}/etc/fstab <<END_FSTAB
+/dev/c0d0p1	/usr		mfs	rw			0	2
+/dev/c0d0p2	/home		mfs	rw			0	2
+none		/sys		devman	rw,rslabel=devman	0	0
+none		/dev/pts	ptyfs	rw,rslabel=ptyfs	0	0
+END_FSTAB
+	add_file_spec "etc/fstab" extra.fstab
+
+	# Add boot monitor
+	cp ${DESTDIR}/usr/mdec/boot_monitor ${ROOT_DIR}/boot_monitor
+	add_file_spec "boot_monitor" extra.boot
+}
+
 #
 # Add CD boot files to the workdir
 #
-workdir_add_cdfiles() {
+workdir_add_cd_files()
+{
+	# create a fstab entry in /etc
+	cat >${ROOT_DIR}/etc/fstab <<END_FSTAB
+none		/sys		devman	rw,rslabel=devman	0	0
+none		/dev/pts	ptyfs	rw,rslabel=ptyfs	0	0
+END_FSTAB
+	add_file_spec "etc/fstab" extra.fstab
+
 	# Add boot monitor
 	cp ${DESTDIR}/usr/mdec/boot_monitor ${ROOT_DIR}/minixboot
 	add_file_spec "minixboot" extra.cdfiles
@@ -120,6 +160,27 @@ workdir_add_cdfiles() {
 	add_file_spec "README.TXT" extra.cdfiles
 }
 
+#
+# Add ramdisk files to the workdir
+#
+workdir_add_ramdisk_files()
+{
+	# create a fstab entry in /etc
+	cat >${ROOT_DIR}/etc/fstab <<END_FSTAB
+none		/sys		devman	rw,rslabel=devman	0	0
+none		/dev/pts	ptyfs	rw,rslabel=ptyfs	0	0
+END_FSTAB
+	add_file_spec "etc/fstab" extra.fstab
+
+	# add early boot rc script
+	cp minix/drivers/storage/ramdisk/rc ${ROOT_DIR}/etc/rc.ramdisk
+	add_file_spec "etc/rc.ramdisk" extra.fstab
+
+	# Add README
+	cp releasetools/release/cd/README.TXT ${ROOT_DIR}/README.TXT
+	add_file_spec "README.TXT" extra.cdfiles
+}
+
 #
 # Extract kernel to designated directory
 #
@@ -184,6 +245,26 @@ create_protos()
 	done
 }
 
+#
+# Create ramdisk image from root directory
+#
+# $1 : size of ramdisk (optional)
+create_ramdisk_image()
+{
+	PATH=$(cd ${CROSS_TOOLS}; pwd):$PATH
+	if [ -z $1 ]
+	then
+		RAMSIZE="-x 5"
+	else
+		RAMSIZE="-b $(( $1 / 512 / 8))"
+	fi
+
+	# Build image
+	_RAMDISKSIZE=$(${CROSS_TOOLS}/nbmkfs.mfs -d ${RAMSIZE} -I 0 ${WORK_DIR}/imgrd.mfs ${WORK_DIR}/proto.root)
+	(cd ${WORK_DIR}; ${TOOLCHAIN_TRIPLET}objcopy -Ibinary -Bi386 -Oi586-elf32-minix imgrd.mfs imgrd.o)
+	${TOOLCHAIN_TRIPLET}clang --sysroot=${DESTDIR} -L ${DESTDIR}/usr/lib -static -o ${WORK_DIR}/mod06_memory ${OBJ}/minix/drivers/storage/memory/memory.o ${WORK_DIR}/imgrd.o -nodefaultlibs -lblockdriver -lchardriver -lsys -lminc
+}
+
 #
 # Bundle packages (won't preinstall them)
 #
@@ -250,10 +331,11 @@ bundle_packages()
 # stuff executed automatically to set up environment
 #
 
-usage() {
+usage()
+{
 	echo "Usage: $0 [options]"
-	echo "  -X xsrc       Build with X11 located in \"xsrc\" and extract its sets for image"
+	echo "  -X xsrc       Build with X11 located in \"xsrc\""
-	echo "                (do not automatically extract for installation CD)"
+	echo "  -x            Add X11 sets to extraction list"
 	echo "  -b            Add ASR service binaries to the image"
 	echo "                (said binaries must be built beforehand)"
 	echo ""
@@ -266,22 +348,21 @@ usage() {
 	echo "  PACKAGE_DIR           Path to packages to bundle (default: none)"
 	echo "  BUNDLE_PACKAGES       List of packages to bundle (default: none)"
 	echo "  PKG_INFO              Path to 'pkg_info' for bundling (default: pkg_info)"
+	echo ""
+	echo "  BUNDLE_SETS           If set to 1, bundle sets for setup (default: only for CD)"
 }
 
 # parse options
-while getopts "iX:bh" c
+while getopts "ixX:bh" c
 do
 	case "$c" in
 		i)	echo "This method of generating the ISO installation media is obsolete."
 			echo "Run ./releasetools/x86_cdimage.sh instead."
 			exit 1;;
 
-		X)	# we don't want to extract X sets by default for the installation CD
+		x)	SETS="$SETS xbase xcomp xetc xfont xserver";;
-			if ! echo "$0" | grep -q cdimage
+
-			then
+		X)	MKX11=yes
-				SETS="$SETS xbase xcomp xetc xfont xserver"
-			fi
-			MKX11=yes
 			export MKX11
 			BUILDVARS="$BUILDVARS -X $OPTARG";;
 
@@ -353,7 +434,11 @@ mkdir -p ${WORK_DIR}
 # get absolute paths to those directories
 CROSS_TOOLS=$(cd ${CROSS_TOOLS} && pwd)
 DESTDIR=$(cd ${DESTDIR} && pwd)
+MODDIR=$(cd ${MODDIR} && pwd)
 OBJ=$(cd ${OBJ} && pwd)
 SETS_DIR=$(cd ${SETS_DIR} && pwd)
 WORK_DIR=$(cd ${WORK_DIR} && pwd)
 ROOT_DIR=${WORK_DIR}/fs
+
+# get list of mods
+mods="`( cd ${MODDIR}; echo mod* | tr ' ' ',' )`"

releasetools/release/cd/README.TXT

@@ -45,7 +45,7 @@ CD CONTENTS:
 This CD contains:
 
    - README.TXT              This file
-   - i386/                   Base system distribution files, for
+   - usr/i386/               Base system distribution files, for
                              installation
    - usr/packages/           Extra packages, if bundled with this CD
    - Everything else         MINIX 3 files

releasetools/release/ramdisk/etc/issue

@@ -0,0 +1,7 @@
+
+Welcome to MINIX.
+
+This is a boot-to-ramdisk system, self-contained in RAM.  You may remove
+the boot media from the computer as it will not be used from now on.
+
+Type "root" at the login prompt, and hit enter.

releasetools/x86_cdimage.sh

@@ -13,6 +13,7 @@ set -e
 
 : ${SETS="minix-base"}
 : ${IMG=minix_x86.iso}
+: ${BUNDLE_SETS=1}
 
 if [ ! -f ${BUILDSH} ]
 then
@@ -24,23 +25,13 @@ fi
 . releasetools/image.defaults
 . releasetools/image.functions
 
-# where the kernel & boot modules will be
-MODDIR=${DESTDIR}/boot/minix/.temp
-
 echo "Building work directory..."
 build_workdir "$SETS"
 
 echo "Adding extra files..."
-workdir_add_sets
+workdir_add_cd_files
-workdir_add_cdfiles
-
-# create a fstab entry in /etc
-cat >${ROOT_DIR}/etc/fstab <<END_FSTAB
-none		/sys		devman	rw,rslabel=devman	0	0
-none		/dev/pts	ptyfs	rw,rslabel=ptyfs	0	0
-END_FSTAB
-add_file_spec "etc/fstab" extra.fstab
 
+# add kernel
 workdir_add_kernel minix_default
 
 # add boot.cfg
@@ -70,10 +61,6 @@ load=/boot/minix_default/mod12_init
 END_BOOT_CFG
 add_file_spec "boot.cfg" extra.cdfiles
 
-# add README.TXT
-cp releasetools/release/cd/README.TXT ${ROOT_DIR}/README.TXT
-add_file_spec "README.TXT" extra.cdfiles
-
 # set correct message of the day (log in and install tip)
 cp releasetools/release/cd/etc/issue ${ROOT_DIR}/etc/issue
 add_file_spec "etc/issue" extra.cdfiles
@@ -94,9 +81,11 @@ fi
 echo "Writing ISO..."
 ${CROSS_TOOLS}/nbmakefs -t cd9660 -F ${WORK_DIR}/input -o "rockridge,bootimage=i386;${DESTDIR}/usr/mdec/bootxx_cd9660,label=MINIX" ${IMG} ${ROOT_DIR}
 
-#mods=$(cd ${MODDIR}; echo mod* | tr ' ' ',')
+echo ""
-
 echo "ISO image at `pwd`/${IMG}"
-echo "To boot this image on kvm:"
+echo ""
-#echo "cd ${MODDIR} && qemu-system-i386 --enable-kvm -kernel kernel -append \"bootcd=1 cdproberoot=1 disable=inet\" -initrd \"${mods}\" -cdrom `pwd`/${IMG}"
+echo "To boot this image on kvm using the bootloader:"
 echo "qemu-system-i386 --enable-kvm -cdrom `pwd`/${IMG}"
+echo ""
+echo "To boot this image on kvm:"
+echo "cd ${MODDIR} && qemu-system-i386 --enable-kvm -kernel kernel -append \"bootcd=1 cdproberoot=1 disable=inet\" -initrd \"${mods}\" -cdrom `pwd`/${IMG}"

releasetools/x86_hdimage.sh

@@ -5,10 +5,6 @@ set -e
 # This script creates a bootable image and should at some point in the future
 # be replaced by the proper NetBSD infrastructure.
 #
-# Supported command line switches:
-#   -i   build iso image instead of qemu imaeg
-#   -b   bitcode build, increase partition sizes as necessary
-#
 
 : ${ARCH=i386}
 : ${OBJ=../obj.${ARCH}}
@@ -35,46 +31,27 @@ fi
 . releasetools/image.defaults
 . releasetools/image.functions
 
-# all sizes are written in 512 byte blocks
-ROOTSIZEARG="-b $((${ROOT_SIZE} / 512 / 8))"
-USRSIZEARG="-b $((${USR_SIZE} / 512 / 8))"
-HOMESIZEARG="-b $((${HOME_SIZE} / 512 / 8))"
-
-# where the kernel & boot modules will be
-MODDIR=${DESTDIR}/boot/minix/.temp
-
 echo "Building work directory..."
 build_workdir "$SETS"
 
 echo "Adding extra files..."
+workdir_add_hdd_files
 
-# create a fstab entry in /etc
+# add kernels
-cat >${ROOT_DIR}/etc/fstab <<END_FSTAB
-/dev/c0d0p1	/usr		mfs	rw			0	2
-/dev/c0d0p2	/home		mfs	rw			0	2
-none		/sys		devman	rw,rslabel=devman	0	0
-none		/dev/pts	ptyfs	rw,rslabel=ptyfs	0	0
-END_FSTAB
-add_file_spec "etc/fstab" extra.fstab
-
-cp ${DESTDIR}/usr/mdec/boot_monitor ${ROOT_DIR}/boot_monitor
-add_file_spec "boot_monitor" extra.boot
-
 add_link_spec "boot/minix_latest" "minix_default" extra.kernel
 workdir_add_kernel minix_default
 workdir_add_kernel minix/$RELEASE_VERSION
 
 # add boot.cfg
 cat >${ROOT_DIR}/boot.cfg <<END_BOOT_CFG
-clear=1
-timeout=5
-default=2
 menu=Start MINIX 3:load_mods /boot/minix_default/mod*; multiboot /boot/minix_default/kernel rootdevname=c0d0p0
 menu=Start latest MINIX 3:load_mods /boot/minix_latest/mod*; multiboot /boot/minix_latest/kernel rootdevname=c0d0p0
 menu=Start latest MINIX 3 in single user mode:load_mods /boot/minix_latest/mod*; multiboot /boot/minix_latest/kernel rootdevname=c0d0p0 bootopts=-s
 menu=Start MINIX 3 ALIX:load_mods /boot/minix_default/mod*;multiboot /boot/minix_default/kernel rootdevname=c0d0p0 console=tty00 consdev=com0 ata_no_dma=1
 menu=Edit menu option:edit
 menu=Drop to boot prompt:prompt
+clear=1
+timeout=5
 default=2
 menu=Start MINIX 3 ($RELEASE_VERSION):load_mods /boot/minix/$RELEASE_VERSION/mod*; multiboot /boot/minix/$RELEASE_VERSION/kernel rootdevname=c0d0p0
 END_BOOT_CFG
@@ -97,6 +74,12 @@ fi
 # Generate /root, /usr and /home partition images.
 #
 echo "Writing disk image..."
+
+# all sizes are written in 512 byte blocks
+ROOTSIZEARG="-b $((${ROOT_SIZE} / 512 / 8))"
+USRSIZEARG="-b $((${USR_SIZE} / 512 / 8))"
+HOMESIZEARG="-b $((${HOME_SIZE} / 512 / 8))"
+
 ROOT_START=${BOOTXX_SECS}
 echo " * ROOT"
 _ROOT_SIZE=$(${CROSS_TOOLS}/nbmkfs.mfs -d ${ROOTSIZEARG} -I $((${ROOT_START}*512)) ${IMG} ${WORK_DIR}/proto.root)
@@ -117,8 +100,11 @@ _HOME_SIZE=$(($_HOME_SIZE / 512))
 ${CROSS_TOOLS}/nbpartition -m ${IMG} ${BOOTXX_SECS} 81:${_ROOT_SIZE} 81:${_USR_SIZE} 81:${_HOME_SIZE}
 ${CROSS_TOOLS}/nbinstallboot -f -m ${ARCH} ${IMG} ${DESTDIR}/usr/mdec/bootxx_minixfs3
 
-
+echo ""
-mods="`( cd ${MODDIR}; echo mod* | tr ' ' ',' )`"
 echo "Disk image at `pwd`/${IMG}"
+echo ""
+echo "To boot this image on kvm using the bootloader:"
+echo "qemu-system-i386 --enable-kvm -m 256 -hda `pwd`/${IMG}"
+echo ""
 echo "To boot this image on kvm:"
-echo "cd ${MODDIR} && qemu-system-i386 --enable-kvm -m 256 -kernel kernel -append \"rootdevname=c0d0p0\" -initrd \"${mods}\" -hda `pwd`/${IMG}"
+echo "cd ${MODDIR} && qemu-system-i386 --enable-kvm -m 256M -kernel kernel -append \"rootdevname=c0d0p0\" -initrd \"${mods}\" -hda `pwd`/${IMG}"

releasetools/x86_ramimage.sh

@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+set -e
+
+#
+# This script creates a bootable image and should at some point in the future
+# be replaced by the proper NetBSD infrastructure.
+#
+
+: ${ARCH=i386}
+: ${OBJ=../obj.${ARCH}}
+: ${TOOLCHAIN_TRIPLET=i586-elf32-minix-}
+: ${BUILDSH=build.sh}
+
+: ${SETS="minix-base"}
+
+if [ ! -f ${BUILDSH} ]
+then
+	echo "Please invoke me from the root source dir, where ${BUILDSH} is."
+	exit 1
+fi
+
+#: ${RAMDISK_SIZE=$(( 200*(2**20) ))}
+
+# set up disk creation environment
+. releasetools/image.defaults
+. releasetools/image.functions
+
+# where the kernel & boot modules will be
+MODDIR=${DESTDIR}/boot/minix/.temp
+
+echo "Building work directory..."
+build_workdir "$SETS"
+
+echo "Adding extra files..."
+workdir_add_ramdisk_files
+
+# set correct message of the day (log in and install tip)
+cp releasetools/release/ramdisk/etc/issue ${ROOT_DIR}/etc/issue
+add_file_spec "etc/issue" extra.cdfiles
+
+echo "Bundling packages..."
+bundle_packages "$BUNDLE_PACKAGES"
+
+echo "Creating specification files..."
+create_input_spec
+create_protos
+
+echo "Writing ramdisk image..."
+# add the other modules for boot
+cp ${MODDIR}/* ${WORK_DIR}
+create_ramdisk_image ${RAMDISK_SIZE}
+
+echo ""
+echo "RAM image modules at ${WORK_DIR}"
+echo ""
+echo "To boot this image on kvm:"
+echo "cd ${WORK_DIR} && qemu-system-i386 --enable-kvm -m 1G -kernel kernel -append \"bootramdisk=1\" -initrd \"${mods}\""

releasetools/x86_usbimage.sh

@@ -0,0 +1,105 @@
+#!/usr/bin/env bash
+set -e
+
+#
+# This script creates a bootable image and should at some point in the future
+# be replaced by the proper NetBSD infrastructure.
+#
+
+: ${ARCH=i386}
+: ${OBJ=../obj.${ARCH}}
+: ${TOOLCHAIN_TRIPLET=i586-elf32-minix-}
+: ${BUILDSH=build.sh}
+
+: ${SETS="minix-base"}
+: ${IMG=minix_x86_usb.img}
+
+if [ ! -f ${BUILDSH} ]
+then
+	echo "Please invoke me from the root source dir, where ${BUILDSH} is."
+	exit 1
+fi
+
+#: ${RAMDISK_SIZE=$(( 200*(2**20) ))}
+: ${BOOTXX_SECS=32}
+
+# set up disk creation environment
+. releasetools/image.defaults
+. releasetools/image.functions
+
+# where the kernel & boot modules will be
+MODDIR=${DESTDIR}/boot/minix/.temp
+
+echo "Building work directory..."
+build_workdir "$SETS"
+
+echo "Adding extra files..."
+workdir_add_ramdisk_files
+
+# set correct message of the day (log in and install tip)
+cp releasetools/release/ramdisk/etc/issue ${ROOT_DIR}/etc/issue
+add_file_spec "etc/issue" extra.cdfiles
+
+echo "Bundling packages..."
+bundle_packages "$BUNDLE_PACKAGES"
+
+echo "Creating specification files..."
+create_input_spec
+create_protos
+
+echo "Writing ramdisk image..."
+# add the other modules for boot
+cp ${MODDIR}/* ${WORK_DIR}
+create_ramdisk_image ${RAMDISK_SIZE}
+
+echo "Writing USB image..."
+# clear ROOT_DIR
+rm -rf ${ROOT_DIR}/*
+echo ". type=dir uid=0 gid=0 mode=0755" > ${WORK_DIR}/extra.boot
+
+# move all modules back to ROOT_DIR
+mv ${WORK_DIR}/kernel ${WORK_DIR}/mod* ${ROOT_DIR}/
+add_file_spec "kernel" extra.boot
+for i in ${ROOT_DIR}/mod*; do
+	add_file_spec $(basename $i) extra.boot
+done
+
+# add boot.cfg
+cat >${ROOT_DIR}/boot.cfg <<END_BOOT_CFG
+menu=Start MINIX 3:load_mods /mod*; multiboot /kernel bootramdisk=1
+menu=Edit menu option:edit
+menu=Drop to boot prompt:prompt
+clear=1
+timeout=5
+default=1
+END_BOOT_CFG
+add_file_spec "boot.cfg" extra.boot
+
+# add boot monitor
+cp ${DESTDIR}/usr/mdec/boot_monitor ${ROOT_DIR}/boot_monitor
+add_file_spec "boot_monitor" extra.boot
+
+# create proto file
+cat ${WORK_DIR}/extra.boot | ${CROSS_TOOLS}/nbtoproto -b ${ROOT_DIR} -o ${WORK_DIR}/proto.boot
+
+ROOT_START=${BOOTXX_SECS}
+_ROOT_SIZE=$(${CROSS_TOOLS}/nbmkfs.mfs -I $((${ROOT_START} * 512)) ${IMG} ${WORK_DIR}/proto.boot)
+_ROOT_SIZE=$(($_ROOT_SIZE / 512))
+
+#
+# Write the partition table using the natively compiled
+# minix partition utility
+#
+${CROSS_TOOLS}/nbpartition -m ${IMG} ${BOOTXX_SECS} 81:${_ROOT_SIZE}
+${CROSS_TOOLS}/nbinstallboot -f -m ${ARCH} ${IMG} ${DESTDIR}/usr/mdec/bootxx_minixfs3
+
+echo ""
+echo "Universally Supported Boot disk image at `pwd`/${IMG}"
+echo ""
+echo "To boot this image on kvm using the bootloader:"
+# This is really, really slow.
+# echo "qemu-system-i386 --enable-kvm -m 1G -usbdevice disk:`pwd`/${IMG}"
+echo "qemu-system-i386 --enable-kvm -m 1G -hda `pwd`/${IMG}"
+echo ""
+echo "To boot this image on kvm:"
+echo "cd ${ROOT_DIR} && qemu-system-i386 --enable-kvm -m 1G -kernel kernel -append \"bootramdisk=1\" -initrd \"${mods}\""