default or selected kernelversion does not have config value CONFIG_ELMC.
Result is shown for kernelversion 6.2.5

3c523 "EtherLink/MC" support

modulename: 3c523.ko

configname: CONFIG_ELMC

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet (10 or 100Mbit)
└─>3c523 "EtherLink/MC" support
In linux kernel since version 2.6.12  
If you have a network (Ethernet) card of this type, say Y and read
the Ethernet-HOWTO, available from

To compile this driver as a module, choose M here. The module
will be called 3c523.

source code: