CONFIG_M5282EVB is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

Motorola M5282EVB board support

configname: CONFIG_M5282EVB

Linux Kernel Configuration
└─>Motorola M5282EVB board support
In linux kernel since version 2.6.12  
Support for the Motorola M5282EVB board.

depends
CONFIG_M528x