CONFIG_MACH_D2NET_V2 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_MACH_D2NET_V2.
Result is shown for kernelversion 6.5.1

LaCie d2 Network v2 NAS Board

modulename: d2net_v2-setup.ko

configname: CONFIG_MACH_D2NET_V2

Linux Kernel Configuration
└─>Marvell Kirkwood Implementations
└─>LaCie d2 Network v2 NAS Board
In linux kernel since version 2.6.37 (release Date: 2011-01-04)  
Say 'Y' here if you want your kernel to support the
LaCie d2 Network v2 NAS.

source code:
/arch/arm/mach-kirkwood/