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

Ethernet support

configname: CONFIG_ETRAX_ETHERNET

Linux Kernel Configuration
└─>Ethernet support
In linux kernel since version 2.6.12  
This option enables the ETRAX FS built-in 10/100Mbit Ethernet
controller.