LEON3 interrupt controllerCONFIG_IRQ3_ENABLE  Say Y here to enable the LEON3 interrupt controller. This is needed  if you want to be able to receive interrupts. Operating systems like  Linux, RTEMS and eCos needs this option to be enabled. If you intend  to use the Bare-C run-time and not use interrupts, you could disable  the interrupt controller and save about 500 gates.LEON3 interrupt controller broadcastCONFIG_IRQ3_BROADCAST_ENABLE  If enabled the broadcast register is used to determine which  interrupt should be sent to all cpus instead of just the first  one that consumes it.