default or selected kernelversion does not have config value CONFIG_HVC_BFIN_JTAG.
Result is shown for kernelversion 6.7-rc3

Blackfin JTAG console

modulename: hvc_bfin_jtag.ko

configname: CONFIG_HVC_BFIN_JTAG

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Blackfin JTAG console
In linux kernel since version 2.6.39 (release Date: 2011-05-18)  
This console uses the Blackfin JTAG to create a console under the
the HVC driver. If you don't have JTAG, then you probably don't
want this option.

source code: