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Thanks for the fast reply

I Downloaded 2.94 Rpi 5 based OS from the official linuxcnc/download site.

The Waveshare user guide states that something in the lines of:
Device Drivers
> Network device support
    > Ethernet driver support
       > Realtek devices
          > Realtek 8169/8168/8101/8125 ethernet support

needs to be added if not using original rpi os.
i am pretty sure that is the problem, as i see the card with lspci as described in the user guide:

 

but not in ifconfig:

 

it is also stated, drivers could be installed manually but its not recommended.
Also, there are other rpi linuxcnc distros floating around, do you think its worth switching around?
 

Shouldn't need recompiling as, our images use a kernel built from the Raspberry Pi GitHub sources.
The only difference being is choosing the kernel config option for real time.
If the standard kernel doesn't work give me a yell and I'll build an update image, as there are a few minor things I would like to add.

Hi all
My goal is to setup a raspberry pi with ethercat.

I have a raspberry Pi 5 with an additional network interface from waveshare ( here )
its planned to use this additional ethernet port for connecting the machine to the network, and the native Port on the Pi for Ethercat.
to use this additional Interface, the kernel needs to be recompiled with some additions to the config file.

I am not familiar with recompiling a kernel, thats why i am seeking help here. 

Has anyone encountered similar issues?
Is there maybe a fixed Kernel to download so i dont need to do the recompile?

greetings
Marc