Bug#613235: : Re: Bug#613235: release-notes: Watchdog during upgrade
I posted the report referenced above at nas-central.org
This is a bad bug in the squeeze->wheezy upgrade procedure in that it
will leave the Linkstation unbootable with no easy repair option if a
pre-upgrade backup of the root file system is not available.
The simplest solution would be to update the squeeze version of
micro-evtd so that it behaves the same way as the wheezy one when
stopped, so upgrading to wheezy from a fully-updated squeeze would not
kill the system!