Brad,
Unfortunately we at the CCS team do not provide the C66x device support, therefore we won't have the most precise answer.
Just like you, I checked the documentation on exceptions and the OXF seems to be a typo and should have been written as SXF. OSSR has no meaning for me (I couldn't find any references about that).
In this case, I think you would have better insights from the experts at the device forum.
Regards,
Rafael