CONFIG_ARCH_MX1ADS is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

mx1ads

modulename: mx1ads.ko

and/or

mach-mx1ads.ko

configname: CONFIG_ARCH_MX1ADS

Linux Kernel Configuration
└─>IMX Implementations
└─>mx1ads
In linux kernel since version 2.6.12  
Say Y here if you are using the Motorola MX1ADS board

source code:
arch/arm/mach-imx/mx1ads.c