nios&vhdl

I connected vhdl, which is o.k., to a full featured nios 2c35 via a 16bit pio.

The seven segment pio and the parts were removed.

The compilation to the sof and quartus was o.k. too.

So I ran the board test, where deleted the seven segment part. That went o.k.

Then I put the simple socket server in the NIOS IDE. Compilation goes o.k.

But...

----

Simple Socket Server starting up

Can't read the MAC address from your board (this probably means

that your flash was erased). We will assign you a MAC address and

static network settings

Please enter your 9-digit serial number. This is printed on a

label under your Nios dev. board. The first 3 digits of the

label are ASJ and the serial number follows this.

-->050500368

050500368

[lwIP]: See STDERR for expanded diagnosis translation.

[lwIP]: [init_done_func] Fatal: lwip_devices_init failed, perhaps ethernet inter

face.

[lwIP]: ERRNO: :

[lwIP]: See STDERR (FAULT_LEVEL is SYSTEM).

[lwIP]: FAULT_LEVEL is SYSTEM.

[lwIP]: FATAL Error, Restart required.

[lwIP]: Locking scheduler - endless loop.

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What is the reason for this?

Is there a collision between vhdl and the nios core? Would the use of an avalon logic component avoid this problem?

Thanks for your help.

andy