From mboxrd@z Thu Jan  1 00:00:00 1970
From: Timur Tabi <timur@freescale.com>
Date: Mon, 2 Aug 2010 16:14:24 -0500
Subject: [U-Boot] [PATCH] fsl: verify writes to the MAC address EEPROM
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Wolfgang Denk wrote:
> Is it correct to assume the the WP signal is connected to some GPIO
> pin which can be set / unset in software?

No, it's a dip switch on the board.  You have to physically set the dip
switch in order write protect or unprotect the EEPROM.