CONFIG_MACH_OTOM is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
NexVision OTOM Board
modulename: mach-otom.ko
configname: CONFIG_MACH_OTOM
Linux Kernel Configuration
└─>S3C24XX Implementations
└─>NexVision OTOM Board
In linux kernel since version 2.6.12
Say Y here if you are using the Nex Vision OTOM board