default or selected kernelversion does not have config value CONFIG_SERIAL_BFIN_CONSOLE.
Result is shown for kernelversion 6.7-rc3
Console on Blackfin serial port
configname: CONFIG_SERIAL_BFIN_CONSOLE
Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>Console on Blackfin serial port