<p>I test stm32f4 + enc28j60 with  <a href="https://github.com/RIOT-OS/RIOT/tree/master/tests/driver_enc28j60">https://github.com/RIOT-OS/RIOT/tree/master/tests/driver_enc28j60</a>,   got following error:</p>
<pre><code>Type '/exit' to exit.
2019-06-15 19:34:09,240 - INFO # main(): Thisgnrc_netif: netdev init failed: -1
2019-06-15 19:34:09,242 - INFO #  etdev init failed: -1
2019-06-15 19:34:09,243 - INFO # 9.04)
2019-06-15 19:34:09,246 - INFO # Test application for the enc28j60 driver
2019-06-15 19:34:09,246 - INFO # 
2019-06-15 19:34:09,251 - INFO # This test just pulls in parts of the GNRC network stack, use the
2019-06-15 19:34:09,258 - INFO # provided shell commands (i.e. ifconfig, ping6) to interact with
2019-06-15 19:34:09,261 - INFO # your enc28j60 device.
2019-06-15 19:34:09,262 - INFO # 
2019-06-15 19:34:09,262 - INFO # Starting the shell now...

</code></pre>

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