This issue indicates the e1000 is too old for modern kernels
gitlab.com/etherlab.org/ethercat/-/issues/60
I would raise an issue there as I have found them very helpful
Hello.
Today I specifically purchased a board with an 8139D chip to run the system with it. I was disappointed, because again I could not compile the Etherkat driver for it. This card has support in the source codes - "DEVICE" catalog, but it was not possible to compile the driver. The option to install DKMS via APT also failed to compile the drivers. Only generic driver works.
I cannot write to the authors using the link you suggested, since I cannot register on this site, although I have studied this correspondence very carefully.
Maybe you can raise this issue on GITLAB? Can the authors make a driver for any popular network card that can always be bought in a store so that there is support in modern kernels? The GENERIC driver works, but causes the system to freeze regularly, which does not have a very good effect on operation. I changed several network cards but the result is sad, freezing remains. If you unload the ezerkat driver, the system works stably without any complaints. A special driver for the adapter is required, but there is nowhere to get it. Alas.
Thank you for your attention and understanding.