CONFIG_SA1100_CERF is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_SA1100_CERF.
Result is shown for kernelversion 6.9.9

CerfBoard

modulename: cerf.ko

configname: CONFIG_SA1100_CERF

Linux Kernel Configuration
└─>SA11x0 Implementations
└─>CerfBoard
In linux kernel since version 2.6.12  
The Intrinsyc CerfBoard is based on the StrongARM 1110 (Discontinued).
More information is available at:
<http://www.intrinsyc.com/products/cerfboard/>.

Say Y if configuring for an Intrinsyc CerfBoard.
Say N otherwise.

source code: