It is strange you don't see it on 3.5.0, but I believe this commit will
fix the problem. It is in process of being applied for quantal.
commit 1f191ef8c716e17b768cb3371b6c507b3932e33e
Author: Rob Herring <rob.herr...@calxeda.com>
Date:   Tue Sep 18 15:09:31 2012 -0500

    ARM: highbank: retry wfi on reset request
    
    In some cases, an interrupt can occur and prevent cause failure to enter
    wfi. This causes reset to hang. Retrying the wfi should be enough to
    prevent reset from hanging.
    
    Signed-off-by: Rob Herring <rob.herr...@calxeda.com>

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https://bugs.launchpad.net/bugs/1061070

Title:
  Reboot sometimes fails on highbank

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