CONFIG_ETRAX_KGDB_PORT1 is not available for thedefaultarchitecture x86.
Result is shown for architecture cris
default or selected kernelversion does not have config value CONFIG_ETRAX_KGDB_PORT1.
Result is shown for kernelversion 6.7-rc3

Serial-1

configname: CONFIG_ETRAX_KGDB_PORT1

Kernel GDB port
└─>Serial-1
In linux kernel since version 2.6.13 (release Date: 2005-08-28)  
Use serial port 1 for kernel debugging.