CONFIG_MACH_REALVIEW_EB is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Support RealView/EB platform
modulename: realview_eb.ko
configname: CONFIG_MACH_REALVIEW_EB
Linux Kernel Configuration
└─>RealView platform type
└─>Support RealView/EB platform
In linux kernel since version 2.6.15 (release Date: 2006-01-02)
Include support for the ARM(R) RealView Emulation Baseboard platform.