diff --git a/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c b/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c
index 5b6608d400..f4fc31913b 100644
--- a/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c
+++ b/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c
@@ -40,6 +40,7 @@
 #define R_UART_LCR            3
 #define   B_UART_LCR_DLAB     BIT7
 #define R_UART_MCR            4
+#define   B_UART_MCR_DTRC     BIT0
 #define   B_UART_MCR_RTS      BIT1
 #define R_UART_LSR            5
 #define   B_UART_LSR_RXRDY    BIT0
@@ -48,6 +49,8 @@
 #define R_UART_MSR            6
 #define   B_UART_MSR_CTS      BIT4
 #define   B_UART_MSR_DSR      BIT5
+#define   B_UART_MSR_RI       BIT6
+#define   B_UART_MSR_DCD      BIT7
 
 //
 // 4-byte structure for each PCI node in PcdSerialPciDeviceInfo
@@ -761,3 +764,337 @@ SerialPortPoll (
   
   return FALSE;
 }
+
+/**
+  Sets the control bits on a serial device.
+
+  @param Control                Sets the bits of Control that are settable.
+
+  @retval RETURN_SUCCESS        The new control bits were set on the serial device.
+  @retval RETURN_UNSUPPORTED    The serial device does not support this operation.
+  @retval RETURN_DEVICE_ERROR   The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetControl (
+  IN UINT32 Control
+  )
+{
+  UINTN SerialRegisterBase;
+  UINT8 Mcr;
+
+  //
+  // First determine the parameter is invalid.
+  //
+  if ((Control & (~(EFI_SERIAL_REQUEST_TO_SEND | EFI_SERIAL_DATA_TERMINAL_READY |
+                    EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE))) != 0) {
+    return RETURN_UNSUPPORTED;
+  }
+
+  SerialRegisterBase = GetSerialRegisterBase ();
+  if (SerialRegisterBase ==0) {
+    return RETURN_UNSUPPORTED;
+  }
+
+  //
+  // Read the Modem Control Register.
+  //
+  Mcr = SerialPortReadRegister (SerialRegisterBase, R_UART_MCR);
+  Mcr &= (~(B_UART_MCR_DTRC | B_UART_MCR_RTS));
+
+  if ((Control & EFI_SERIAL_DATA_TERMINAL_READY) == EFI_SERIAL_DATA_TERMINAL_READY) {
+    Mcr |= B_UART_MCR_DTRC;
+  }
+
+  if ((Control & EFI_SERIAL_REQUEST_TO_SEND) == EFI_SERIAL_REQUEST_TO_SEND) {
+    Mcr |= B_UART_MCR_RTS;
+  }
+
+  //
+  // Write the Modem Control Register.
+  //
+  SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, Mcr);
+
+  return RETURN_SUCCESS;
+}
+
+/**
+  Retrieve the status of the control bits on a serial device.
+
+  @param Control                A pointer to return the current control signals from the serial device.
+
+  @retval RETURN_SUCCESS        The control bits were read from the serial device.
+  @retval RETURN_UNSUPPORTED    The serial device does not support this operation.
+  @retval RETURN_DEVICE_ERROR   The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortGetControl (
+  OUT UINT32 *Control
+  )
+{
+  UINTN SerialRegisterBase;
+  UINT8 Msr;
+  UINT8 Mcr;
+  UINT8 Lsr;
+
+  SerialRegisterBase = GetSerialRegisterBase ();
+  if (SerialRegisterBase ==0) {
+    return RETURN_UNSUPPORTED;
+  }
+
+  *Control = 0;
+
+  //
+  // Read the Modem Status Register.
+  //
+  Msr = SerialPortReadRegister (SerialRegisterBase, R_UART_MSR);
+
+  if ((Msr & B_UART_MSR_CTS) == B_UART_MSR_CTS) {
+    *Control |= EFI_SERIAL_CLEAR_TO_SEND;
+  }
+
+  if ((Msr & B_UART_MSR_DSR) == B_UART_MSR_DSR) {
+    *Control |= EFI_SERIAL_DATA_SET_READY;
+  }
+
+  if ((Msr & B_UART_MSR_RI) == B_UART_MSR_RI) {
+    *Control |= EFI_SERIAL_RING_INDICATE;
+  }
+
+  if ((Msr & B_UART_MSR_DCD) == B_UART_MSR_DCD) {
+    *Control |= EFI_SERIAL_CARRIER_DETECT;
+  }
+
+  //
+  // Read the Modem Control Register.
+  //
+  Mcr = SerialPortReadRegister (SerialRegisterBase, R_UART_MCR);
+
+  if ((Mcr & B_UART_MCR_DTRC) == B_UART_MCR_DTRC) {
+    *Control |= EFI_SERIAL_DATA_TERMINAL_READY;
+  }
+
+  if ((Mcr & B_UART_MCR_RTS) == B_UART_MCR_RTS) {
+    *Control |= EFI_SERIAL_REQUEST_TO_SEND;
+  }
+
+  if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {
+    *Control |= EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE;
+  }
+
+  //
+  // Read the Line Status Register.
+  //
+  Lsr = SerialPortReadRegister (SerialRegisterBase, R_UART_LSR);
+
+  if ((Lsr & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) == (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) {
+    *Control |= EFI_SERIAL_OUTPUT_BUFFER_EMPTY;
+  }
+
+  if ((Lsr & B_UART_LSR_RXRDY) == 0) {
+    *Control |= EFI_SERIAL_INPUT_BUFFER_EMPTY;
+  }
+
+  return RETURN_SUCCESS;
+}
+
+/**
+  Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
+  data bits, and stop bits on a serial device.
+
+  @param BaudRate           The requested baud rate. A BaudRate value of 0 will use the
+                            device's default interface speed.
+                            On output, the value actually set.
+  @param ReveiveFifoDepth   The requested depth of the FIFO on the receive side of the
+                            serial interface. A ReceiveFifoDepth value of 0 will use
+                            the device's default FIFO depth.
+                            On output, the value actually set.
+  @param Timeout            The requested time out for a single character in microseconds.
+                            This timeout applies to both the transmit and receive side of the
+                            interface. A Timeout value of 0 will use the device's default time
+                            out value.
+                            On output, the value actually set.
+  @param Parity             The type of parity to use on this serial device. A Parity value of
+                            DefaultParity will use the device's default parity value.
+                            On output, the value actually set.
+  @param DataBits           The number of data bits to use on the serial device. A DataBits
+                            vaule of 0 will use the device's default data bit setting.
+                            On output, the value actually set.
+  @param StopBits           The number of stop bits to use on this serial device. A StopBits
+                            value of DefaultStopBits will use the device's default number of
+                            stop bits.
+                            On output, the value actually set.
+
+  @retval RETURN_SUCCESS            The new attributes were set on the serial device.
+  @retval RETURN_UNSUPPORTED        The serial device does not support this operation.
+  @retval RETURN_INVALID_PARAMETER  One or more of the attributes has an unsupported value.
+  @retval RETURN_DEVICE_ERROR       The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetAttributes (
+  IN OUT UINT64             *BaudRate,
+  IN OUT UINT32             *ReceiveFifoDepth,
+  IN OUT UINT32             *Timeout,
+  IN OUT EFI_PARITY_TYPE    *Parity,
+  IN OUT UINT8              *DataBits,
+  IN OUT EFI_STOP_BITS_TYPE *StopBits
+  )
+{
+  UINTN     SerialRegisterBase;
+  UINT32    SerialBaudRate;
+  UINTN     Divisor;
+  UINT8     Lcr;
+  UINT8     LcrData;
+  UINT8     LcrParity;
+  UINT8     LcrStop;
+
+  SerialRegisterBase = GetSerialRegisterBase ();
+  if (SerialRegisterBase ==0) {
+    return RETURN_UNSUPPORTED;
+  }
+
+  //
+  // Check for default settings and fill in actual values.
+  //
+  if (*BaudRate == 0) {
+    *BaudRate = PcdGet32 (PcdSerialBaudRate);
+  }
+  SerialBaudRate = (UINT32) *BaudRate;
+
+  if (*DataBits == 0) {
+    LcrData = (UINT8) (PcdGet8 (PcdSerialLineControl) & 0x3);
+    *DataBits = LcrData + 5;
+  } else {
+    if ((*DataBits < 5) || (*DataBits > 8)) {
+      return RETURN_INVALID_PARAMETER;
+    }
+    //
+    // Map 5..8 to 0..3
+    //
+    LcrData = (UINT8) (*DataBits - (UINT8) 5);
+  }
+
+  if (*Parity == DefaultParity) {
+    LcrParity = (UINT8) ((PcdGet8 (PcdSerialLineControl) >> 3) & 0x7);
+    switch (LcrParity) {
+      case 0:
+        *Parity = NoParity;
+        break;
+
+      case 3:
+        *Parity = EvenParity;
+        break;
+
+      case 1:
+        *Parity = OddParity;
+        break;
+
+      case 7:
+        *Parity = SpaceParity;
+        break;
+
+      case 5:
+        *Parity = MarkParity;
+        break;
+
+      default:
+        break;
+    }
+  } else {
+    if ((*Parity < NoParity) || (*Parity > SpaceParity)) {
+      return RETURN_INVALID_PARAMETER;
+    }
+    switch (*Parity) {
+      case NoParity:
+        LcrParity = 0;
+        break;
+
+      case EvenParity:
+        LcrParity = 3;
+        break;
+
+      case OddParity:
+        LcrParity = 1;
+        break;
+
+      case SpaceParity:
+        LcrParity = 7;
+        break;
+
+      case MarkParity:
+        LcrParity = 5;
+        break;
+
+      default:
+        break;
+    }
+  }
+
+  if (*StopBits == DefaultStopBits) {
+    LcrStop = (UINT8) ((PcdGet8 (PcdSerialLineControl) >> 2) & 0x1);
+    switch (LcrStop) {
+      case 0:
+        *StopBits = OneStopBit;
+        break;
+
+      case 1:
+        if (*DataBits == 5) {
+          *StopBits = OneFiveStopBits;
+        } else {
+          *StopBits = TwoStopBits;
+        }
+        break;
+
+      default:
+        break;
+    }
+  } else {
+    if ((*StopBits < OneStopBit) || (*StopBits > TwoStopBits)) {
+      return RETURN_INVALID_PARAMETER;
+    }
+    switch (*StopBits) {
+      case OneStopBit:
+        LcrStop = 0;
+        break;
+
+      case OneFiveStopBits:
+      case TwoStopBits:
+        LcrStop = 1;
+        break;
+
+      default:
+        break;
+    }
+  }
+
+  //
+  // Calculate divisor for baud generator
+  //    Ref_Clk_Rate / Baud_Rate / 16
+  //
+  Divisor = PcdGet32 (PcdSerialClockRate) / (SerialBaudRate * 16);
+  if ((PcdGet32 (PcdSerialClockRate) % (SerialBaudRate * 16)) >= SerialBaudRate * 8) {
+    Divisor++;
+  }
+
+  //
+  // Configure baud rate
+  //
+  SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, B_UART_LCR_DLAB);
+  SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_HIGH, (UINT8) (Divisor >> 8));
+  SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_LOW, (UINT8) (Divisor & 0xff));
+
+  //
+  // Clear DLAB and configure Data Bits, Parity, and Stop Bits.
+  // Strip reserved bits from line control value
+  //
+  Lcr = (UINT8) ((LcrParity << 3) | (LcrStop << 2) | LcrData);
+  SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8) (Lcr & 0x3F));
+
+  return RETURN_SUCCESS;
+}
+