Chris, FWIW
For background; The infamous "hang on DSI" during boot-up occurs when the DSI reprograms the PCI Bridge Chip in order to give higher priorty to our cards. What this ultimately translates to is a drastic reduction in the occurance of the dreaded DAE -6042 "PCI Bus too Busy" error. Owners of B&W G3 and first generation G4s (i.e the ones that are equipped with PCI graphics) will experience this occcasional lockup. AGP-equipped G4s do not require this modification.
Regards
e