E1000_CTRL_SPD_100
ctrl |= E1000_CTRL_SPD_100;
ctrl |= E1000_CTRL_SPD_100;
ctrl |= E1000_CTRL_SPD_100;
reg = ctrl_reg & ~(E1000_CTRL_SPD_1000 | E1000_CTRL_SPD_100);
ctrl |= E1000_CTRL_SPD_100;
ctrl &= ~(E1000_CTRL_SPD_1000 | E1000_CTRL_SPD_100);
E1000_CTRL_SPD_100 | /* Force Speed to 100 */