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LEON3 interrupt controller
CONFIG_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 broadcast
CONFIG_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.

Secondary interrupts
CONFIG_IRQ3_SEC
  The interrupt controller handles 15 interrupts by default (1 - 15).
  These correspond to the 15 SPARC asyncronous traps (0x11 - 0x1F),
  and AMBA interrupts 1 - 15. This option will enable 16 additional
  (secondary) interrupts, corresponding to AMBA interrupts 16 - 31.
  The secondary interrupts will be multiplexed onto one of the first
  15 interrupts. The total number of handled interrupts can then
  be up to 30 (14 primary and 16 secondary).

Number of interrupts
CONFIG_IRQ3_NSEC
  Defines which of the first 15 interrupts should be used for the
  secondary (16 - 31) interrupts. Interrupt 15 should be avoided
  since it is not maskable by the processor.