CONFIG_CPU_FR405 is not available for thedefaultarchitecture x86.
Result is shown for architecture frv
Include FR405 core support
configname: CONFIG_CPU_FR405
Linux Kernel Configuration
└─>Fujitsu FR-V system setup
└─>CPU core support
└─>Include FR405 core support
In linux kernel since version 2.6.12
This enables support for the FR405 CPU