This patch blocks initramfs startup until udev events are 
handled to hopefully fix two issues:
- switch from initramfs to real root may fail sporadically when udev is
  not ready (see VD13 bug #14 and https://bugs.launchpad.net/ubuntu/+source/linux/+bug/613273)
- RAID setup may fail later if it's interrupted once during 
  initramfs startup (see SFI bug #303 and https://bugs.launchpad.net/ubuntu/+source/udev/+bug/610107)

--- /usr/share/initramfs-tools/scripts/init-bottom/udev	2010-10-29 23:42:13.000000000 +0200
+++ /usr/share/initramfs-tools/scripts/init-bottom/udev	2011-09-23 09:45:22.248666993 +0200
@@ -16,8 +16,11 @@
 	;;
 esac
 
+echo "calling udevadm settle"
+/sbin/udevadm settle
 
 # Stop udevd, we'll miss a few events while we run init, but we catch up
+echo "calling pkill for udevd"
 pkill udevd
 
 # Move /dev to the real filesystem