CONFIG_ETRAX_ETH0_USE_LEDGRPNULL is not available for thedefaultarchitecture x86.
Result is shown for architecture cris
default or selected kernelversion does not have config value CONFIG_ETRAX_ETH0_USE_LEDGRPNULL.
Result is shown for kernelversion 6.2.5

Use no LEDs for eth0

configname: CONFIG_ETRAX_ETH0_USE_LEDGRPNULL

Eth0 led group
└─>Use no LEDs for eth0
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
Use no LEDs for eth0