CONFIG_M528x is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

MCF528x

modulename: m528x.ko

and/or

pit.ko

configname: CONFIG_M528x

CPU
└─>MCF528x
In linux kernel since version 2.6.12  
Motorola ColdFire 5280/5282 processor support.

source code:
arch/m68k/platform/coldfire/

depends
 or CONFIG_COLDFIRE |
NOT | CONFIG_MMU

is selected by
CONFIG_FEC