CONFIG_MACH_DB88F5281 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Marvell Orion-2 Development Board

modulename: db88f5281-setup.ko

configname: CONFIG_MACH_DB88F5281

Linux Kernel Configuration
└─>Marvell Orion
└─>Marvell Orion-2 Development Board
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-2 (88F5281) Development Board

source code:
arch/arm/mach-orion5x/db88f5281-setup.c