CONFIG_MACH_EDMINI_V2_DT is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

LaCie Ethernet Disk mini V2 (Flattened Device Tree)

modulename: edmini_v2-setup.ko

configname: CONFIG_MACH_EDMINI_V2_DT

Linux Kernel Configuration
└─>Orion Implementations
└─>LaCie Ethernet Disk mini V2 (Flattened Device Tree)
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say 'Y' here if you want your kernel to support the
LaCie Ethernet Disk mini V2 (Flattened Device Tree).

source code:
arch/arm/mach-orion5x/edmini_v2-setup.c