CONFIG_ARCH_CNS3XXX is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Cavium Networks CNS3XXX family
modulename: cns3xxx.ko
configname: CONFIG_ARCH_CNS3XXX
Linux Kernel Configuration
└─>Cavium Networks CNS3XXX family
In linux kernel since version 2.6.35 (release Date: 2010-08-01)
Support for Cavium Networks CNS3XXX platform.