CONFIG_MACH_MOP500 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
U8500 Development platform, MOP500 versions
modulename: board-mop500.ko
configname: CONFIG_MACH_MOP500
Linux Kernel Configuration
└─>Ux500 target platform (boards)
└─>U8500 Development platform, MOP500 versions
In linux kernel since version 3.1 (release Date: 2011-10-24)
Include support for the MOP500 development platform.