CONFIG_MIPS_BOARDS_GEN is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_MIPS_BOARDS_GEN (not configurable)

modulename: irq-msc01.ko

configname: CONFIG_MIPS_BOARDS_GEN

Linux/MIPS Kernel Configuration
└─>Machine selection
└─>MIPS_BOARDS_GEN
In linux kernel since version 2.6.12