AM2434: About the interrupt router

hello:

there is  a question about the gpio interrupt router

When I use syscfg, why do I only have 2 routers to choose from, Route 8 and Route 9, but what should I do when I need 3 gpio interrupts

The SPI Interrupt Map of main GPIOMUX  is  MAIN_GPIOMUX_INTROUTER0_OUTP_0 to  MAIN_GPIOMUX_INTROUTER0_OUTP_15

thanks