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The related HW_OCOTP_MAC_ADDR0, HW_OCOTP_MAC_ADDR1, HW_OCOTP_MAC_ADDR2 OTP registers will be used for the purposes illustrated in this AN.
{{ImportantMessage|text='''Warning!!''' eFuse programming is a permanent and non reversible action. Pay attention to the values and commands used during MAC programming.}}
==== eth0 eFuse programming ====
U-Boot uses the <code>fuse prog</code> command for writing the MAC address into the eFuse. The MAC address should be divided in high 16 bit and low 32 bits, for example MAC address <code>AB:CD:12:34:56:78</code> for eth0 is then divided into :
