diff -Nru grub-installer-1.128ubuntu2/debian/changelog grub-installer-1.128ubuntu2multiprep1/debian/changelog
--- grub-installer-1.128ubuntu2/debian/changelog	2016-01-04 09:06:45.000000000 -0500
+++ grub-installer-1.128ubuntu2multiprep1/debian/changelog	2016-02-26 08:14:04.000000000 -0500
@@ -1,3 +1,10 @@
+grub-installer (1.128ubuntu2multiprep1) UNRELEASED; urgency=medium
+
+  * grub-installer [ppc64el]: support multiple PReP partitions on
+    component devices of a MD/mdadm device (LP: #)
+
+ -- Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>  Fri, 26 Feb 2016 10:14:04 -0300
+
 grub-installer (1.128ubuntu2) xenial; urgency=medium
 
   * If grub-installer/choose_bootdev only has one non-manual choice, default
diff -Nru grub-installer-1.128ubuntu2/grub-installer grub-installer-1.128ubuntu2multiprep1/grub-installer
--- grub-installer-1.128ubuntu2/grub-installer	2016-01-04 09:05:50.000000000 -0500
+++ grub-installer-1.128ubuntu2multiprep1/grub-installer	2016-02-26 08:10:01.000000000 -0500
@@ -503,21 +503,38 @@
 	# By default, use the first PReP partition found (prep-bootdev).
 	# If available, prefer a PReP partition in the same device (disc_offered).
 	# (the matching works on devices with/without disk-partition separator.)
+	# On MD/mdadm devices, each component device may have a PReP partition.
+
+	wipe_bootdevs=""
 	wipe_bootdev="$(/usr/lib/grub-installer/prep-bootdev)"
 	for prep_p in $(/usr/lib/grub-installer/prep-bootdev -l); do
 		if [ "${prep_p%[0-9]*}" = "${disc_offered%[0-9]*}" ]; then
 			wipe_bootdev=$prep_p
 			break
 		fi
+
+		if echo $disc_offered | grep -q '/dev/md[0-9]\+'; then
+			if mdadm --detail --verbose $disc_offered \
+			     | grep -o '/dev/[sv]d[a-z]\+' \
+			     | grep "${prep_p%[0-9]*}"; then
+				wipe_bootdevs="$wipe_bootdevs $prep_p"
+			fi
+		fi
 	done
 	unset prep_p
 
-	if [ -n "$wipe_bootdev" ]; then
-		info "Wiping PReP partition $wipe_bootdev"
-		log-output -t grub-installer dd if=/dev/zero of="$wipe_bootdev" bs=512 count="$(blockdev --getsz "$wipe_bootdev")"
-	else
-		info "WARNING: PReP partition not found."
+	if [ -z "$wipe_bootdevs" ]; then
+		wipe_bootdevs="$wipe_bootdev"
 	fi
+
+	for wipe_bootdev in $wipe_bootdevs; do
+		if [ -n "$wipe_bootdev" ]; then
+			info "Wiping PReP partition $wipe_bootdev"
+			log-output -t grub-installer dd if=/dev/zero of="$wipe_bootdev" bs=512 count="$(blockdev --getsz "$wipe_bootdev")"
+		else
+			info "WARNING: PReP partition not found."
+		fi
+	done
 	;;
 esac
 
@@ -997,6 +1014,14 @@
 
 	# Install grub on each space separated disk in the list
 	bootdevs="$bootdev"
+
+	case $ARCH:$grub_package in
+	    ppc64el/*:grub-ieee1275)
+		# On MD/mdadm devices, each component device may have a PReP partition.
+		bootdevs="$wipe_bootdevs"
+		;;
+	esac
+
 	for bootdev in $bootdevs; do
 		grub_install_params=
 		if ! is_floppy "$bootdev"; then