CONFIG_ETRAX_RESCUE_SER2 is not available for thedefaultarchitecture x86.
Result is shown for architecture cris
default or selected kernelversion does not have config value CONFIG_ETRAX_RESCUE_SER2.
Result is shown for kernelversion 6.7-rc3

Serial-2

configname: CONFIG_ETRAX_RESCUE_SER2

Product rescue-port
└─>Serial-2
In linux kernel since version 2.6.12  
Use serial port 2 as the rescue port.