--- debianutils-1.16.7.orig/mkboot	2005-05-16 01:59:01.000000000 +0100
+++ debianutils-1.16.7/mkboot	2005-05-16 01:59:45.000000000 +0100
@@ -8,7 +8,7 @@
 PATH=$PATH:/sbin:/usr/sbin
 
 # root partition
-rootpart=$(rdev | cut -d ' ' -f 1)
+rootpart=$(grep -o "root=[^ ]*" /proc/cmdline | cut -d= -f2)
 # temporary directory
 tmpdir=${TMPDIR-/tmp}