CONFIG_MACH_REAL6410 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

REAL6410

modulename: mach-real6410.ko

configname: CONFIG_MACH_REAL6410

Linux Kernel Configuration
└─>REAL6410
In linux kernel since version 2.6.36 (release Date: 2010-10-20)  
Machine support for the CoreWind REAL6410

source code: