From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Thu, 24 Feb 2005 20:20:52 -0800
From: Eugene Surovegin <ebs@ebshome.net>
To: "Howard, Marc" <Marc.Howard@KLA-Tencor.com>
Message-ID: <20050225042052.GA12703@gate.ebshome.net>
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Cc: Linuxppc-embedded@ozlabs.org
Subject: Re: Gigibit ethernet ports on Ocotea + 2.6.10
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On Thu, Feb 24, 2005 at 06:42:40PM -0800, Howard, Marc wrote:
> console=ttyS0,115200 root=/dev/nfs rw
> nfsroot=192.168.168.108:/projects/targets/ppc_4xx
> ip=192.168.168.111:192.168.168.108:192.168.168.108:255.255.255.0:ppc440:
> :off

You haven't searched archives very hard :). 

Format of ip=... can be found in net/ipv4/ipconfig.c:

/*
 *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
 *  command line parameter. It consists of option fields separated by colons in
 *  the following order:
 *
 *  <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
 *
 *  Any of the fields can be empty which means to use a default value:
 *      <client-ip>     - address given by BOOTP or RARP
 *      <server-ip>     - address of host returning BOOTP or RARP packet
 *      <gw-ip>         - none, or the address returned by BOOTP
 *      <netmask>       - automatically determined from <client-ip>, or the
 *                        one returned by BOOTP
 *      <host name>     - <client-ip> in ASCII notation, or the name returned
 *                        by BOOTP
 *      <device>        - use all available devices
 *      <PROTO>:
 *         off|none         - don't do autoconfig at all (DEFAULT)
 *         on|any           - use any configured protocol
 *         dhcp|bootp|rarp  - use only the specified protocol
 *         both             - use both BOOTP and RARP (not DHCP)
 */


BTW, looks like your ip=.. line is incorrect, you missed <device> 
parameter.

--
Eugene