Need R3 value passed into _start on the SBC8260

[diekema_jon]

        In arch/ppc/mbxboot/head_8260.S, _start assumes that R3 is
        pointing to the board configuration data.  What does the
        MontaVista custom ROM on the EST SBC8260 board set R3 to before it
        jumps to _start?

        start_:
        mr      r11,r3          /* Save pointer to residual/board data */
        mr      r25,r5          /* Save OFW pointer */

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