Is there a special Kernel parameter (sysctl.conf), that makes it possible to use the Network. So how it is now I can´t work with it. What can I do at the moment?
I think we're simply not resetting enough when the RX FIFO overflow
happens.
Just for fun I checked the OpenBSD GEM driver to see what they do.
When an overflow occurs, they bump the statistic, record the current
read and write fifo pointer registers, and schedule a watchdog timer
for 400ms into the future.
If the watchdog timer sees that the RX FIFO overflow bit is still set
in the RX status register, and the RX FIFO read and write pointers
have not changed, it resets the entire chip.
We unconditionally reset the RX MAC when an overflow occurs, that may
simply not be enough to unwedge this thing.