CONFIG_BF54xM is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin

CONFIG_BF54xM (not configurable)

configname: CONFIG_BF54xM

Blackfin Kernel Configuration
└─>Blackfin Processor Options
└─>BF54xM
In linux kernel since version 2.6.29 (release Date: 2009-03-23)