CONFIG_B4_QDS is not available for the default architecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_B4_QDS.
Result is shown for kernelversion 5.9.9

Freescale B4 QDS

modulename: b4_qds.ko
configname: CONFIG_B4_QDS

Linux Kernel Configuration
└─> Freescale Book-E Machine Type
└─> Freescale B4 QDS

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: