CONFIG_BLACKSTAMP is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_BLACKSTAMP.
Result is shown for kernelversion 6.7-rc3

BlackStamp

modulename: blackstamp.ko

configname: CONFIG_BLACKSTAMP

System type
└─>BlackStamp
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Support for the BlackStamp board. Hardware info available at
http://blackfin.uclinux.org/gf/project/blackstamp/

source code:
arch/blackfin/mach-bf533/boards/blackstamp.c