Update init to use /etc/banner for presence test, remove postinit

git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@4604 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/generic-2.6/files/init

@@ -62,11 +62,11 @@ done
 COUNTER=0
 while [ $COUNTER -lt 10 ]; do
   sleep 1
-  [ -e /mnt/postinit ] && let COUNTER=10;
+  [ -e /mnt/etc/banner ] && let COUNTER=10;
   let COUNTER=COUNTER+1
 done
-[ -e /mnt/postinit ] || {
-  export FAILSAFE="No postinit"
+[ -e /mnt/etc/banner ] || {
+  export FAILSAFE="No Openwrt FS"
   exec /bin/busybox init
 }
 
@@ -76,5 +76,5 @@ mount -o move /proc /mnt/proc
 mount -o move /dev /mnt/dev
 mount -o move /tmp /mnt/tmp
 mount -o move /sys /mnt/sys
-
-exec switch_root -c /dev/console /mnt /postinit
+mount none /tmp -t tmpfs
+exec switch_root -c /dev/console /mnt /sbin/init

target/linux/generic-2.6/files/postinit

@@ -1,4 +0,0 @@
-#!/bin/ash
-mount none /dev -t devfs
-exec /bin/busybox init
-