diff -up os-prober-1.57/common.sh.bootpartnamefix os-prober-1.57/common.sh
--- os-prober-1.57/common.sh.bootpartnamefix	2013-02-03 23:56:39.585511891 +0330
+++ os-prober-1.57/common.sh	2013-02-05 19:42:14.652151904 +0330
@@ -246,7 +246,7 @@ linux_mount_boot () {
 				if [ "$bindfrom" != "$tmpmnt/boot" ]; then
 					if mount --bind "$bindfrom" "$tmpmnt/boot"; then
 						mounted=1
-						bootpart="$1"
+						bootpart="$tmppart"
 					else
 						debug "failed to bind-mount $bindfrom onto $tmpmnt/boot"
 					fi
@@ -254,6 +254,15 @@ linux_mount_boot () {
 			fi
 			if [ "$mounted" ]; then
 				:
+			elif [ -e "$tmppart" ]; then
+				bootpart="$tmppart"
+				boottomnt="$tmppart"
+			elif [ -e "$tmpmnt/$tmppart" ]; then
+				bootpart="$tmppart"
+				boottomnt="$tmpmnt/$tmppart"
+			elif [ -e "/target/$tmppart" ]; then
+				bootpart="$tmppart"
+				boottomnt="/target/$tmppart"
 			elif [ -e "$1" ]; then
 				bootpart="$1"
 				boottomnt="$1"