CONFIG_M520x is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k
MCF520x
modulename: m520x.ko
configname: CONFIG_M520x
Linux Kernel Configuration
└─>MCF520x
In linux kernel since version 2.6.15 (release Date: 2006-01-02)
Freescale Coldfire 5207/5208 processor support.