default or selected kernelversion does not have config value CONFIG_SERIAL_ETRAXFS.
Result is shown for kernelversion 6.7-rc3
ETRAX FS serial port support
modulename: etraxfs-uart.ko
configname: CONFIG_SERIAL_ETRAXFS
Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>Device Tree and Open Firmware support
└─>ETRAX FS serial port support