how to find the octeon driver in menuconfig?

[Chen shuo]

I want to recompile the octeon driver, when i searching the octeon,it 
logs out

│ Symbol: AHCI_OCTEON [=n] │
   │ Type  : tristate │
   │ Defined at drivers/ata/Kconfig:240 │
   │   Prompt: Cavium Octeon Soc Serial ATA │
   │   Depends on: ATA [=y] && HAS_DMA [=y] && SATA_AHCI_PLATFORM [=y] 
&& CAVIUM_OCTEON_SOC │
   │ Location: │
   │     -> Device Drivers │
   │ (1)   -> Serial ATA and Parallel ATA drivers (libata) (ATA [=y]) │
   │         -> Cavium Octeon Soc Serial ATA (AHCI_OCTEON [=n]) │
│ │
│ │
   │ Symbol: CAVIUM_OCTEON_SOC [=CAVIUM_OCTEON_SOC] │
   │ Type  : unknown │
│ │
│ │
   │ Symbol: CPU_CAVIUM_OCTEON [=CPU_CAVIUM_OCTEON] │
   │ Type  : unknown

I have set the ATA [=y]、HAS_DMA [=y]、SATA_AHCI_PLATFORM [=y].But i 
don't  know about CAVIUM_OCTEON_SOC

When i search the CAVIUM_OCTEON_SOC,It print out:

Symbol: CAVIUM_OCTEON_SOC [=CAVIUM_OCTEON_SOC] │
   │ Type  : unknown

What should i do?

Thanks

Chen Shuo
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