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The <code>eth1addr</code> U-Boot variable is then used for the second ethernet interface MAC address management.
==== eFuse locking ====
The OTP eFuse registers should be locked in order to avoid unwanted registers (and then MAC addresses) modifications. OTP lock grants the MAC values cannot be modified anymore.
The two MAC addresses - even if sharing register <code>bank:9 word:1</code> - can be programmed at different times.
At the opposite, eFuse lock should be performed for both simultaneously. The registers lock can be forced using the following command:
<pre>
fuse prog -y 0 0 c000
</pre>
=== Linux kernel MAC address ===
