Swapping eth0 and eth1 on OK335xS board

/*******************************************************************************
 *                   Swapping eth0 and eth1 on OK335xS board
 * 声明：
 *     有时候我们可能希望能够将eth0和eth1的名字换一下。
 *
 *                                          2015-9-30 阴 深圳 南山平山村 曾剑锋
 ******************************************************************************/

一、参考文档：
    https://e2e.ti.com/support/arm/sitara_arm/f/791/p/415084/1482324

二、几种网卡接口的缩写全称：
    Described in the following sections is the 3-port switch (3PSW) Ethernet subsystem.
    The 3-port switch gigabit ethernet subsystem provides ethernet packet communication
    and can be configured as an ethernet switch. It provides the gigabit media independent
    interface (GMII),reduced gigabit media independent interface (RGMII), reduced media
    independent interface (RMII), the management data input output (MDIO) for physical
    layer device (PHY) management.

三、修改方法(etc/init.d/rc)：
    ......
    #echo `ifconfig -a`
    ifconfig eth0 down
    ifconfig eth1 down
    ip link set dev eth0 name eth2
    ip link set dev eth1 name eth0
    ip link set dev eth2 name eth1
    ifconfig eth0 up
    ifconfig eth1 up
    #echo `ifconfig -a`
    ......