- compatibility with Wishbone and the VIC interrupt controller
    - possibility of losing an edge-triggered IRQ and hanging interrupts when
      different cores trigger interrupts very close to each other.
    The modified interrupter implements a retry mechanism, that is, if the IRQ line
    gets stuck for longer than certain period (g_retry_timeout), an IRQ cycle
    is repeated on the VME bus.

signoff Tomas.W.