In lwIP, only the RTL8211E is supported. The ArtyZ7 series of development boards by Digilent use the newer RTL8211F and require a modified version of lwIP to work.
Digilent never upstreamed those modifications.
Modifications can be found here : https://github.com/Digilent/embeddedsw/tree/realtek-21.1
AFAIK, it was supposed to be upstreamed but forgotten.
In lwIP, only the RTL8211E is supported. The ArtyZ7 series of development boards by Digilent use the newer RTL8211F and require a modified version of lwIP to work. Digilent never upstreamed those modifications. Modifications can be found here : https://github.com/Digilent/embeddedsw/tree/realtek-21.1 AFAIK, it was supposed to be upstreamed but forgotten.