CONFIG_CPU16B is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

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.

selects
CONFIG_SNEHA

depends
CONFIG_M5272