CONFIG_MACH_AT2440EVB is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Avantech AT2440EVB development board
modulename: mach-at2440evb.ko
configname: CONFIG_MACH_AT2440EVB
Linux Kernel Configuration
└─>S3C2440 and S3C2442 Machines
└─>Avantech AT2440EVB development board
In linux kernel since version 2.6.27 (release Date: 2008-10-09)
Say Y here if you are using the AT2440EVB development board