E1000_SCTL
#define E1000_82542_SCTL E1000_SCTL
wr32(E1000_SCTL, E1000_SCTL_DISABLE_SERDES_LOOPBACK);
igb_write_8bit_ctrl_reg(hw, E1000_SCTL, 0x00, 0x0C);
igb_write_8bit_ctrl_reg(hw, E1000_SCTL, 0x01, 0x78);
igb_write_8bit_ctrl_reg(hw, E1000_SCTL, 0x1B, 0x23);
igb_write_8bit_ctrl_reg(hw, E1000_SCTL, 0x23, 0x15);
wr32(E1000_SCTL, E1000_ENABLE_SERDES_LOOPBACK);
regs_buff[4] = rd32(E1000_SCTL);