diff --git a/tools/tools/nanobsd/Makefile b/tools/tools/nanobsd/Makefile
index 0506f1263cf8..f63292f68867 100644
--- a/tools/tools/nanobsd/Makefile
+++ b/tools/tools/nanobsd/Makefile
@@ -10,10 +10,19 @@
 # parallism flag for make.
 MAKEJ?="-j12"
 
+.if defined(WITH_GEOM_VOL)
+# Do not hardcode device names, use FFS volume labels instead.
+# Requires 'options GEOM_VOL' in kernel.
+PRIROOTSLICE=	vol/sysflash1
+ALTROOTSLICE=	vol/sysflash2
+CFGSLICE=	vol/cfgflash
+.else
 # Some CF cards behave as slaves, (eg Lexar) and are assigned ad1.
 DEVICE?=	ad0
-ROOTSLICE=	${DEVICE}s1a
-CONFSLICE=	${DEVICE}s3
+PRIROOTSLICE=	${DEVICE}s1a
+ALTROOTSLICE=	${DEVICE}s2a
+CFGSLICE=	${DEVICE}s3
+.endif
 
 # Physical disk paramters.  Use diskinfo(8) on the target platform
 # to find the correct numbers.  We assume 512 bytes sectors.
@@ -23,7 +32,7 @@ SECTS?=501760
 
 # Number of sectors in the data slice (ad0s3).  The rest of the disk
 # will be split evenly between the two image slices (ad0s1/ad0s2)
-DATASLICE?=10240
+DATASIZE?=10240
 
 # You probably do not need to change these.
 WORLDDIR?= ${.CURDIR}/../../..
@@ -62,7 +71,6 @@ all:	buildworld installworld buildimage
 #
 Customize:	_.cs
 _.cs:	_.iw _.di _.ik _.di
-	echo "/dev/${ROOTSLICE} / ufs ro 1 1" >  ${WD}/etc/fstab
 .if empty(CUSTOMIZE_PATH)
 	# useful stuff for diskless boot
 	sed -i "" -e /beastie/d ${WD}/boot/loader.rc
@@ -144,7 +152,7 @@ _.md:	_.cs
 	mkdir -p ${WD}/conf/base/etc
 	( cd ${WD}/etc && find . -print | cpio -dumpl ../conf/base/etc )
 	mkdir -p ${WD}/conf/default/etc
-	echo "mount -o ro /dev/${CONFSLICE}" > ${WD}/conf/default/etc/remount
+	echo "mount -o ro /dev/${CFGSLICE}" > ${WD}/conf/default/etc/remount
 	ln -s var/tmp ${WD}/tmp
 	mtree -deU -f ${WD}/etc/mtree/BSD.root.dist -p ${WD}/
 	mtree -deU -f ${WD}/etc/mtree/BSD.usr.dist -p ${WD}/usr
@@ -157,7 +165,10 @@ _.md:	_.cs
 		${SECTS} \
 		${HD} \
 		${SC} \
-		${DATASLICE} \
+		${DATASIZE} \
+		${PRIROOTSLICE} \
+		${ALTROOTSLICE} \
+		${CFGSLICE} \
 		${WD} ${.OBJDIR}/_.i \
 		${CFGMASTER_PATH} \
 		> _.md.tmp 2>&1
diff --git a/tools/tools/nanobsd/i386.diskimage b/tools/tools/nanobsd/i386.diskimage
index fe34af6d73ce..e3a130265525 100644
--- a/tools/tools/nanobsd/i386.diskimage
+++ b/tools/tools/nanobsd/i386.diskimage
@@ -8,7 +8,9 @@
 #
 # Called as:
 #
-# ${.CURDIR}/i386.diskimage $SECTS $HD $SC $DATASLICE ${.OBJDIR}/_.w ${.OBJDIR}/_.i [ ${.CURDIR}/cfgmaster ]
+# ${.CURDIR}/i386.diskimage $SECTS $HD $SC $DATASIZE \
+#   $PRIROOTSLICE $ALTROOTSLICE $CFGSLICE \
+#   ${.OBJDIR}/_.w ${.OBJDIR}/_.i [ ${.CURDIR}/cfgmaster ]
 #
 # XXX: newfs params.
 
@@ -17,25 +19,49 @@ set -ex
 SECTS=$1
 HD=$2
 SC=$3
-DATASLICE=$4
-WD=$5
-IMG=$6
-CFGMASTER=$7
+DATASIZE=$4
+PRIROOTSLICE=$5
+ALTROOTSLICE=$6
+CFGSLICE=$7
+WD=$8
+IMG=$9
+CFGMASTER=$10
 
 TMPFILE0=`mktemp -t nanobsd`
 TMPFILE1=`mktemp -t nanobsd`
 TMPMNT=`mktemp -d -t nanobsd`
 
+make_fstab () {
+  echo "/dev/$1 / ufs ro 1 1" > ${WD}/etc/fstab
+}
+
+get_label () {
+  case "$1" in
+    vol/*)
+      echo -n "-L "; basename $1
+      ;;
+    *)
+      echo ""
+      ;;
+  esac
+}
+
+PRIROOTLABEL=`get_label ${PRIROOTSLICE}`
+ALTROOTLABEL=`get_label ${ALTROOTSLICE}`
+CFGLABEL=`get_label ${CFGSLICE}`
+
+# Attach MD device and prepare slices
+
 dd if=/dev/zero of=${TMPFILE0} count=${SECTS}
 MD=`mdconfig -a -t vnode -f ${TMPFILE0} -x ${SC} -y ${HD}`
 rm -f ${TMPFILE0}
 (
-sl=`expr "(" ${SECTS} - ${SC} - ${DATASLICE} ")" / 2`
+sl=`expr "(" ${SECTS} - ${SC} - ${DATASIZE} ")" / 2`
 cyl=`expr ${SECTS} / ${SC} / ${HD}`
 echo g c${cyl} h${HD} s${SC}
 echo p 1 165 ${SC} $sl
 echo p 2 165 `expr ${SC} + $sl` $sl
-echo p 3 165 `expr ${SC} + $sl + $sl` ${DATASLICE}
+echo p 3 165 `expr ${SC} + $sl + $sl` ${DATASIZE}
 ) > ${TMPFILE1}
 cat ${TMPFILE1}
 fdisk -i -f ${TMPFILE1} ${MD}
@@ -43,18 +69,40 @@ fdisk ${MD}
 boot0cfg -B -b ${WD}/boot/boot0sio -s 1 -m 3 ${MD}
 rm -f ${TMPFILE1}
 bsdlabel -w -B ${MD}s1
-newfs -O1 -U ${MD}s1a
-newfs -O1 -U ${MD}s3
+
+# Prepare primary root slice
+
+newfs ${PRIROOTLABEL} -O1 -U ${MD}s1a
 mount /dev/${MD}s1a ${TMPMNT}
 (cd ${WD} && find . -print | cpio -dump ${TMPMNT}) || true
+make_fstab ${PRIROOTSLICE}
 df ${TMPMNT}
 umount ${TMPMNT}
+
+# Prepare alternative root slice
+
+dd if=/dev/${MD}s1 of=/dev/${MD}s2 bs=64k
+if [ -n "${ALTROOTLABEL}" ]; then
+  tunefs ${ALTROOTLABEL} /dev/${MD}s2a
+fi
+mount /dev/${MD}s2a ${TMPMNT}
+make_fstab ${ALTROOTSLICE}
+umount ${TMPMNT}
+
+# Prepare configuration slice
+
+newfs ${CFGLABEL}  -O1 -U ${MD}s3
 if [ -d "${CFGMASTER}" ]; then
   mount /dev/${MD}s3 ${TMPMNT}
   ( cd ${CFGMASTER} && find . -print | cpio -dumpl ${TMPMNT} )
   umount ${TMPMNT}
 fi
-dd if=/dev/${MD}s1 of=/dev/${MD}s2 bs=64k
+
+# Create flash images
+
 dd if=/dev/${MD} of=${IMG} bs=64k
 dd if=/dev/${MD}s1 of=${IMG}.s1 bs=64k
+
+# Detach MD device
+
 mdconfig -d -u ${MD}