+
+CONFIG_FEC_FIXED_SPEED
+ Optional, selects a fixed speed on the MAC interface without asking some
+ phy. This is usefull if there is a direct MAC <-> MAC connection, for
+ example if the CPU is connected directly via the RGMII interface to a
+ ethernet-switch.
+
+Reading the ethaddr from the SoC eFuses:
+if CONFIG_FEC_MXC is defined and the U-Boot environment does not contain the
+ethaddr variable, then its value gets read from the corresponding eFuses in
+the SoC. See the README files of the specific SoC for details.