CONFIG_CPU_ARM1020 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Support ARM1020T (rev 0) processor

modulename: proc-arm1020.ko

configname: CONFIG_CPU_ARM1020

Linux Kernel Configuration
└─>Support ARM1020T (rev 0) processor
In linux kernel since version 2.6.12  
The ARM1020 is the 32K cached version of the ARM10 processor,
with an addition of a floating-point unit.

Say Y if you want support for the ARM1020 processor.
Otherwise, say N.

source code: