CONFIG_MACH_RD88F5182 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Marvell Orion-NAS Reference Design

modulename: rd88f5182-setup.ko

configname: CONFIG_MACH_RD88F5182

Linux Kernel Configuration
└─>Orion Implementations
└─>Marvell Orion-NAS Reference Design
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
Say 'Y' here if you want your kernel to support the
Marvell Orion-NAS (88F5182) RD2

source code:
arch/arm/mach-orion5x/rd88f5182-setup.c