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

MCF528x

modulename: m528x.ko

configname: CONFIG_M528x

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

source code:
selects
CONFIG_GENERIC_CLOCKEVENTS
CONFIG_HAVE_CACHE_SPLIT
CONFIG_HAVE_IPSBAR

depends
NOT CONFIG_MMU

is selected by
CONFIG_FEC