CONFIG_MACH_NSA310_DT is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
ZyXEL NSA-310 (Flattened Device Tree)
modulename: board-nsa310.ko
configname: CONFIG_MACH_NSA310_DT
Linux Kernel Configuration
└─>Marvell Kirkwood Implementations
└─>ZyXEL NSA-310 (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
ZyXEL NSA-310 board (Flattened Device Tree).
ZyXEL NSA-310 board (Flattened Device Tree).