Interrupt nesting on SC589

Hi everybody,

My app has been developed on an 21469 and uses interrupt nesting; it runs fine. Now it is being ported to a SC589, but interrupt nesting does not work.
Anybody who succeeded interrupt nesting to run on a SC589? ADI is reluctant (or not be able) to solve this issue. I would be very pleased with your help.

Thanks a lot and best regards,