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[A.J.Bellido]

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Hi,
We need to assign an unique MAC address to each SBC. We want to do it by changin this variable´s value using  the u-boot console, but when we try to change the ethaddr enviroment variable, we get this error:
Can't overwrite "ethaddr"
How do we must do that?

[admin]

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The U-boot does not allow the MAC address be changed once it is set.  You can erase the NAND FLASH sector that stores the U-boot environment variables at 0x60000.

[mimmus]

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[setenv ethaddr XX:XX:XX:XX:XX:XXnand erase 0x00060000 0x0004000nand erase 0x000A0000 0x0004000saveenv]

setenv ethaddr XX:XX:XX:XX:XX:XX
nand erase 0x00060000 0x0004000
nand erase 0x000A0000 0x0004000
saveenv

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Or in U-boot source code,

in  include/configs/at91sam9250ek.h file enable the variable:
#define CONFIG_ENV_OVERWRITE 1