CONFIG_B4_QDS is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Freescale B4 QDS

modulename: b4_qds.ko

configname: CONFIG_B4_QDS

Linux Kernel Configuration
└─>Freescale Book-E Machine Type
└─>Freescale B4 QDS
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This option enables support for the B4 QDS board
The B4 application development system B4 QDS is a complete
debugging environment intended for engineers developing
applications for the B4.

source code:
/arch/powerpc/platforms/85xx/