I *think* the problem is due to non-recgnition of the platform (uname -a string).
You seem to have a newer kernel with SP3 (3.0??) as opposed to 2.6x with SP1 earlier.
IIRC, 3.0 Kernel support was delivered later with a patch....have you patched the 6.20 with all the latest patches including the bundle 6.21?
If so, log a support call, support should be able to deliver you a fix.
Regards,
Nikhil