CONFIG_BUBINGA is not available for thedefaultarchitecture x86.
Result is shown for architecture ppc

Bubinga

modulename: bubinga.ko

configname: CONFIG_BUBINGA

Machine Type
└─>Bubinga
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This option enables support for the IBM 405EP evaluation board.

source code:
arch/ppc/platforms/4xx/bubinga.c