CONFIG_MACH_MX31ADS is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Support MX31ADS platforms
modulename: mach-mx31ads.ko
configname: CONFIG_MACH_MX31ADS
Linux Kernel Configuration
└─>Freescale i.MX support
└─>Support MX31ADS platforms
In linux kernel since version 2.6.23 (release Date: 2007-10-09)
Include support for MX31ADS platform. This includes specific
configurations for the board and its peripherals.
configurations for the board and its peripherals.