CONFIG_STMARK2 is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k
Sysam stmark2 board support
modulename: stmark2.ko
configname: CONFIG_STMARK2
Linux Kernel Configuration
└─>Sysam stmark2 board support
In linux kernel since version 4.2 (release Date: 2015-08-30)
Support for the Sysam stmark2 open-hardware generic board.