CONFIG_MACH_U8500_MOP is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

U8500 Early Development platform

modulename: board-mop500.ko

configname: CONFIG_MACH_U8500_MOP

Linux Kernel Configuration
└─>ST-Ericsson platform type
└─>U8500 Early Development platform
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
Include support for mop500 development platform
based on U8500 architecture. The platform is based
on early drop silicon version of 8500.

source code: