CONFIG_AMCORE is not available for the selected architecture x86.
Result is shown for architecture m68k

Kernelspace AMCORE board support

modulename: amcore.ko

configname: CONFIG_AMCORE

Linux Kernel Configuration
└─>Kernelspace AMCORE board support
In linux kernel since version 3.10 (release Date: 2013-06-30)
Support for the Kernelspace AMCORE open-hardware generic board.
source code:
arch/m68k/coldfire/amcore.c
depends
CONFIG_M5307