CONFIG_CPU_ARM925T is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Support ARM925T processor

modulename: proc-arm925.ko

configname: CONFIG_CPU_ARM925T

Linux Kernel Configuration
└─>Support ARM925T processor
In linux kernel since version 2.6.12  
The ARM925T is a mix between the ARM920T and ARM926T, but with
different instruction and data caches. It is used in TI's OMAP
device family.

Say Y if you want support for the ARM925T processor.
Otherwise, say N.

source code: