CONFIG_MACH_EUKREA_CPUIMX25SD is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Support Eukrea CPUIMX25 Platform

modulename: mach-eukrea_cpuimx25.ko

configname: CONFIG_MACH_EUKREA_CPUIMX25SD

Linux Kernel Configuration
└─>Support Eukrea CPUIMX25 Platform
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/arm/mach-imx/mach-eukrea_cpuimx25.c