CONFIG_MACH_DB88F6281_BP is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_MACH_DB88F6281_BP.
Result is shown for kernelversion 6.2.5

Marvell DB-88F6281-BP Development Board

modulename: db88f6281-bp-setup.ko

configname: CONFIG_MACH_DB88F6281_BP

Linux Kernel Configuration
└─>Marvell Kirkwood Implementations
└─>Marvell DB-88F6281-BP Development Board
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Say 'Y' here if you want your kernel to support the
Marvell DB-88F6281-BP Development Board.

source code:
arch/arm/mach-kirkwood/db88f6281-bp-setup.c