CONFIG_MACH_EUKREA_CPUIMX25 is not available for the selected architecture x86.
Result is shown for architecture arm

Support Eukrea CPUIMX25 Platform

modulename: mach-cpuimx25.ko

configname: CONFIG_MACH_EUKREA_CPUIMX25

Linux Kernel Configuration
└─>Support Eukrea CPUIMX25 Platform
In linux kernel since version 2.6.36 (release Date: 2010-10-20)
source code:
arch/arm/mach-mx25/mach-cpuimx25.c