E1000_GIOCTL
igb_write_8bit_ctrl_reg(hw, E1000_GIOCTL, 0x00, 0xEC);
igb_write_8bit_ctrl_reg(hw, E1000_GIOCTL, 0x61, 0xDF);
igb_write_8bit_ctrl_reg(hw, E1000_GIOCTL, 0x34, 0x05);
igb_write_8bit_ctrl_reg(hw, E1000_GIOCTL, 0x2F, 0x81);