Hello Pirmin,
Currently it crashes during startup (something wen creating sockets). The current progress is at:
I am wondering why you need sockets in the first place. I do neither own nor know Intel IGC devices so I might miss something obvious but they appear to be 2.5Gbs ethernet devices.
From a quick glance at your branch it looks like you used the 'pc_wifi_drv' as a template which I would not recommend (as it contains functionality not strictly needed for "simple" ethernet drivers, e.g. the socket call interface).
I think a more fitting blueprint would be the allwinner 'nic/emac' driver, chances are that you do not have to implement that many functions yourself.
Regards Josef