CONFIG_MACH_KZM9G_REFERENCE is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

KZM-A9-GT board - Reference Device Tree Implementation

modulename: board-kzm9g-reference.ko

configname: CONFIG_MACH_KZM9G_REFERENCE

Linux Kernel Configuration
└─>KZM-A9-GT board - Reference Device Tree Implementation
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Use reference implementation of KZM-A9-GT board support
which makes as greater use of device tree at the expense
of not supporting a number of devices.

This is intended to aid developers

source code: