--- syslinux-install_update.orig	2015-06-28 18:05:15.439457527 +0200
+++ syslinux-install_update	2015-06-28 18:05:00.026294239 +0200
@@ -169,14 +169,14 @@
             exit 1
         fi
         boot="boot"
-        bootpart="$bootdev"
+        bootpart="$(readlink -f "$bootdev")"
     elif [[ $rootfs ]]; then
         if ! check_is_in "$rootfs" "${syslinux_fs[@]}"; then
             echo "/ (root) file system is not supported by Syslinux"
             exit 1
         fi
         boot="root"
-        bootpart="$rootdev"
+        bootpart="$(readlink -f "$rootdev")"
     else
         echo "Could not find filesystem on / (root) or /boot."
         exit 1