enable ethernet in the DTB for rock5b users

[colemickens]

Hi,

I've noticed that there's a Rock5b-similar board in the wild that ships with a u-boot that has ethernet enabled. Would it be possible for you to update the EVB board DTB to include Ethernet for the Rock5b?

[RadxaYuntian]

We use RTL8125 for Ethernet on ROCK 5B, which even on Linux requires out-of-tree kernel driver. Since this is a PCIe device there is no need to edit DTS, but porting and maintaining a driver designed for another system is currently out of scope.

[RadxaYuntian]

It appears that r8169 driver could be used with RTL8125, and U-Boot has this driver (although seems very old, written in 2003). I'll reopen this for future investigation.