CONFIG_CPU16B is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k
default or selected kernelversion does not have config value CONFIG_CPU16B.
Result is shown for kernelversion 6.2.5

Sneha Technologies S.L. Sarasvati board support

configname: CONFIG_CPU16B

Linux Kernel Configuration
└─>Sneha Technologies S.L. Sarasvati board support
In linux kernel since version 2.6.12  
Support for the SNEHA CPU16B board.

depends
CONFIG_M5272