CONFIG_CPU_FR401 is not available for thedefaultarchitecture x86.
Result is shown for architecture frv

Include FR401 core support

configname: CONFIG_CPU_FR401

Linux Kernel Configuration
└─>Fujitsu FR-V system setup
└─>CPU core support
└─>Include FR401 core support
In linux kernel since version 2.6.12  
This enables support for the FR401, FR401A and FR403 CPUs

depends
NOT CONFIG_MMU