default or selected kernelversion does not have config value CONFIG_EL1.
Result is shown for kernelversion 6.2.5

3c501 "EtherLink" support

modulename: 3c501.ko

configname: CONFIG_EL1

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet (10 or 100Mbit)
└─>3c501 "EtherLink" 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
<>. Also, consider buying a
new card, since the 3c501 is slow, broken, and obsolete: you will
have problems. Some people suggest to ping ("man ping") a nearby
machine every minute ("man cron") when using this card.

To compile this driver as a module, choose M here. The module
will be called 3c501.

source code: