CONFIG_MIPS_BOARDS_GEN is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_MIPS_BOARDS_GEN.
Result is shown for kernelversion 6.2.5

CONFIG_MIPS_BOARDS_GEN (not configurable)

configname: CONFIG_MIPS_BOARDS_GEN

Linux Kernel Configuration
└─>MIPS_BOARDS_GEN
In linux kernel since version 2.6.12