diff --git a/OptionRomPkg/CirrusLogic5430Dxe/CirrusLogic5430I2c.c b/OptionRomPkg/CirrusLogic5430Dxe/CirrusLogic5430I2c.c
new file mode 100644
index 0000000000..377a597646
--- /dev/null
+++ b/OptionRomPkg/CirrusLogic5430Dxe/CirrusLogic5430I2c.c
@@ -0,0 +1,433 @@
+/** @file
+  I2C Bus implementation upon CirrusLogic.
+
+  Copyright (c) 2008 - 2009, Intel Corporation
+  All rights reserved. This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "CirrusLogic5430.h"
+#include "CirrusLogic5430I2c.h"
+
+#define SEQ_ADDRESS_REGISTER    0x3c4
+#define SEQ_DATA_REGISTER       0x3c5
+
+#define I2C_CONTROL             0x08
+#define I2CDAT_IN               7
+#define I2CCLK_IN               2
+#define I2CDAT_OUT              1
+#define I2CCLK_OUT              0
+
+#define I2C_BUS_SPEED           100  //100kbps
+
+/**
+  PCI I/O byte write function.
+
+  @param  PciIo        The pointer to PCI_IO_PROTOCOL.
+  @param  Address      The bit map of I2C Data or I2C Clock pins.
+  @param  Data         The date to write.
+
+**/
+VOID
+I2cOutb (
+  EFI_PCI_IO_PROTOCOL    *PciIo,
+  UINTN                  Address,
+  UINT8                  Data
+  )
+{
+  PciIo->Io.Write (
+             PciIo,
+             EfiPciIoWidthUint8,
+             EFI_PCI_IO_PASS_THROUGH_BAR,
+             Address,
+             1,
+             &Data
+             );
+}
+/**
+  PCI I/O byte read function.
+
+  @param  PciIo        The pointer to PCI_IO_PROTOCOL.
+  @param  Address      The bit map of I2C Data or I2C Clock pins.
+
+  return byte value read from PCI I/O space.
+
+**/
+UINT8
+I2cInb (
+  EFI_PCI_IO_PROTOCOL    *PciIo,
+  UINTN                  Address
+  )
+{
+  UINT8 Data;
+
+  PciIo->Io.Read (
+             PciIo,
+             EfiPciIoWidthUint8,
+             EFI_PCI_IO_PASS_THROUGH_BAR,
+             Address,
+             1,
+             &Data
+             );
+  return Data;
+}
+
+/**
+  Read status of I2C Data and I2C Clock Pins.
+
+  @param  PciIo        The pointer to PCI_IO_PROTOCOL.
+  @param  Blt          The bit map of I2C Data or I2C Clock pins.
+
+  @retval 0            Low on I2C Data or I2C Clock Pin.
+  @retval 1            High on I2C Data or I2C Clock Pin.
+
+**/
+UINT8
+I2cPinRead (
+  EFI_PCI_IO_PROTOCOL    *PciIo,
+  UINT8                  Bit
+  )
+{
+  I2cOutb (PciIo, SEQ_ADDRESS_REGISTER, I2C_CONTROL);
+  return (UINT8) ((I2cInb (PciIo, SEQ_DATA_REGISTER) >> Bit ) & 0xfe);
+}
+
+
+/**
+  Set/Clear I2C Data and I2C Clock Pins.
+
+  @param  PciIo              The pointer to PCI_IO_PROTOCOL.
+  @param  Blt                The bit map to controller I2C Data or I2C Clock pins.
+  @param  Value              1 or 0 stands for Set or Clear I2C Data and I2C Clock Pins.
+
+**/
+VOID
+I2cPinWrite (
+  EFI_PCI_IO_PROTOCOL    *PciIo,
+  UINT8                  Bit,
+  UINT8                  Value
+  )
+{
+  UINT8        Byte;
+  I2cOutb (PciIo, SEQ_ADDRESS_REGISTER, I2C_CONTROL);
+  Byte = (UINT8) (I2cInb (PciIo, SEQ_DATA_REGISTER) & (UINT8) ~(1 << Bit)) ;
+  Byte = (UINT8) (Byte | ((Value & 0x01) << Bit));
+  I2cOutb (PciIo, SEQ_DATA_REGISTER, (UINT8) (Byte | 0x40));
+  return;
+}
+
+/**
+  Read/write delay acoording to I2C Bus Speed.
+
+**/
+VOID
+I2cDelay (
+  VOID
+  )
+{
+  MicroSecondDelay (1000 / I2C_BUS_SPEED);
+}
+
+/**
+  Write a 8-bit data onto I2C Data Pin.
+
+  @param  PciIo              The pointer to PCI_IO_PROTOCOL.
+  @param  Data               The byte data to write.
+
+**/
+VOID
+I2cSendByte (
+  EFI_PCI_IO_PROTOCOL    *PciIo,
+  UINT8                  Data
+  )
+{
+  UINTN                  Index;
+  //
+  // Send byte data onto I2C Bus
+  //
+  for (Index = 0; Index < 8; Index --) {
+    I2cPinWrite (PciIo, I2CDAT_OUT, (UINT8) (Data >> (7 - Index)));
+    I2cPinWrite (PciIo, I2CCLK_OUT, 1);
+    I2cDelay ();
+    I2cPinWrite (PciIo, I2CCLK_OUT, 0);
+  }
+}
+
+/**
+  Read a 8-bit data from I2C Data Pin.
+
+  @param  PciIo              The pointer to PCI_IO_PROTOCOL.
+
+  Return the byte data read from I2C Data Pin.
+**/
+UINT8
+I2cReceiveByte (
+  EFI_PCI_IO_PROTOCOL    *PciIo
+  )
+{
+  UINT8          Data;
+  UINTN          Index;
+
+  Data = 0;
+  //
+  // Read byte data from I2C Bus
+  //
+  for (Index = 0; Index < 8; Index --) {
+    I2cPinWrite (PciIo, I2CCLK_OUT, 1);
+    I2cDelay ();
+    Data = (UINT8) (Data << 1);
+    Data = (UINT8) (Data | I2cPinRead (PciIo, I2CDAT_IN));
+    I2cPinWrite (PciIo, I2CCLK_OUT, 0);
+  }
+
+  return Data;
+}
+
+/**
+  Receive an ACK signal from I2C Bus.
+
+  @param  PciIo              The pointer to PCI_IO_PROTOCOL.
+
+**/
+BOOLEAN
+I2cWaitAck (
+  EFI_PCI_IO_PROTOCOL    *PciIo
+  )
+{
+  //
+  // Wait for ACK signal
+  //
+  I2cPinWrite (PciIo, I2CDAT_OUT, 1);
+  I2cPinWrite (PciIo, I2CCLK_OUT, 1);
+  I2cDelay ();
+  if (I2cPinRead (PciIo, I2CDAT_IN) == 0) {
+    I2cPinWrite (PciIo, I2CDAT_OUT, 1);
+    return TRUE;
+  } else {
+    return FALSE;
+  }
+}
+
+/**
+  Send an ACK signal onto I2C Bus.
+
+  @param  PciIo              The pointer to PCI_IO_PROTOCOL.
+
+**/
+VOID
+I2cSendAck (
+  EFI_PCI_IO_PROTOCOL    *PciIo
+  )
+{
+  I2cPinWrite (PciIo, I2CCLK_OUT, 1);
+  I2cPinWrite (PciIo, I2CDAT_OUT, 1);
+  I2cPinWrite (PciIo, I2CDAT_OUT, 0);
+  I2cPinWrite (PciIo, I2CCLK_OUT, 0);
+}
+
+/**
+  Start a I2C transfer on I2C Bus.
+
+  @param  PciIo              The pointer to PCI_IO_PROTOCOL.
+
+**/
+VOID
+I2cStart (
+  EFI_PCI_IO_PROTOCOL    *PciIo
+  )
+{
+  //
+  // Init CLK and DAT pins
+  //
+  I2cPinWrite (PciIo, I2CCLK_OUT, 1);
+  I2cPinWrite (PciIo, I2CDAT_OUT, 1);
+  //
+  // Start a I2C transfer, set SDA low from high, when SCL is high
+  //
+  I2cPinWrite (PciIo, I2CDAT_OUT, 0);
+  I2cPinWrite (PciIo, I2CCLK_OUT, 0);
+}
+
+/**
+  Stop a I2C transfer on I2C Bus.
+
+  @param  PciIo              The pointer to PCI_IO_PROTOCOL.
+
+**/
+VOID
+I2cStop (
+  EFI_PCI_IO_PROTOCOL    *PciIo
+  )
+{
+  //
+  // Stop a I2C transfer, set SDA high from low, when SCL is high
+  //
+  I2cPinWrite (PciIo, I2CDAT_OUT, 0);
+  I2cPinWrite (PciIo, I2CCLK_OUT, 1);
+  I2cPinWrite (PciIo, I2CDAT_OUT, 1);
+}
+
+/**
+  Read one byte data on I2C Bus.
+
+  Read one byte data from the slave device connectet to I2C Bus.
+  If Data is NULL, then ASSERT().
+
+  @param  PciIo              The pointer to PCI_IO_PROTOCOL.
+  @param  DeviceAddress      Slave device's address.
+  @param  RegisterAddress    The register address on slave device.
+  @param  Data               The pointer to returned data if EFI_SUCCESS returned.
+
+  @retval EFI_DEVICE_ERROR
+  @retval EFI_SUCCESS
+
+**/
+EFI_STATUS
+EFIAPI
+I2cReadByte (
+  EFI_PCI_IO_PROTOCOL    *PciIo,
+  UINT8                  DeviceAddress,
+  UINT8                  RegisterAddress,
+  UINT8                  *Data
+  )
+{
+  ASSERT (Data != NULL);
+
+  //
+  // Start I2C transfer
+  //
+  I2cStart (PciIo);
+
+  //
+  // Send slave address with enabling write flag
+  //
+  I2cSendByte (PciIo, (UINT8) (DeviceAddress & 0xfe));
+
+  //
+  // Wait for ACK signal
+  //
+  if (I2cWaitAck (PciIo) == FALSE) {
+    return EFI_DEVICE_ERROR;
+  }
+
+  //
+  // Send register address
+  //
+  I2cSendByte (PciIo, RegisterAddress);
+
+  //
+  // Wait for ACK signal
+  //
+  if (I2cWaitAck (PciIo) == FALSE) {
+    return EFI_DEVICE_ERROR;
+  }
+
+  //
+  // Send slave address with enabling read flag
+  //
+  I2cSendByte (PciIo, (UINT8) (DeviceAddress | 0x01));
+
+  //
+  // Wait for ACK signal
+  //
+  if (I2cWaitAck (PciIo) == FALSE) {
+    return EFI_DEVICE_ERROR;
+  }
+
+  //
+  // Read byte data from I2C Bus
+  //
+  *Data = I2cReceiveByte (PciIo);
+
+  //
+  // Send ACK signal onto I2C Bus
+  //
+  I2cSendAck (PciIo);
+
+  //
+  // Stop a I2C transfer
+  //
+  I2cStop (PciIo);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Write one byte data onto I2C Bus.
+
+  Write one byte data to the slave device connectet to I2C Bus.
+  If Data is NULL, then ASSERT().
+
+  @param  PciIo              The pointer to PCI_IO_PROTOCOL.
+  @param  DeviceAddress      Slave device's address.
+  @param  RegisterAddress    The register address on slave device.
+  @param  Data               The pointer to write data.
+
+  @retval EFI_DEVICE_ERROR
+  @retval EFI_SUCCESS
+
+**/
+EFI_STATUS
+EFIAPI
+I2cWriteByte (
+  EFI_PCI_IO_PROTOCOL    *PciIo,
+  UINT8                  DeviceAddress,
+  UINT8                  RegisterAddress,
+  UINT8                  *Data
+  )
+{
+  ASSERT (Data != NULL);
+
+  I2cStart (PciIo);
+  //
+  // Send slave address with enabling write flag
+  //
+  I2cSendByte (PciIo, (UINT8) (DeviceAddress & 0xfe));
+
+  //
+  // Wait for ACK signal
+  //
+  if (I2cWaitAck (PciIo) == FALSE) {
+    return EFI_DEVICE_ERROR;
+  }
+
+  //
+  // Send register address
+  //
+  I2cSendByte (PciIo, RegisterAddress);
+
+  //
+  // Wait for ACK signal
+  //
+  if (I2cWaitAck (PciIo) == FALSE) {
+    return EFI_DEVICE_ERROR;
+  }
+
+  //
+  // Send byte data onto I2C Bus
+  //
+  I2cSendByte (PciIo, *Data);
+
+  //
+  // Wait for ACK signal
+  //
+  if (I2cWaitAck (PciIo) == FALSE) {
+    return EFI_DEVICE_ERROR;
+  }
+
+  //
+  // Stop a I2C transfer
+  //
+  I2cStop (PciIo);
+
+  return EFI_SUCCESS;
+}
+
+
+
diff --git a/OptionRomPkg/CirrusLogic5430Dxe/CirrusLogic5430I2c.h b/OptionRomPkg/CirrusLogic5430Dxe/CirrusLogic5430I2c.h
new file mode 100644
index 0000000000..b39f47f719
--- /dev/null
+++ b/OptionRomPkg/CirrusLogic5430Dxe/CirrusLogic5430I2c.h
@@ -0,0 +1,68 @@
+/** @file
+  I2c Bus byte read/write functions.
+
+  Copyright (c) 2008 - 2009, Intel Corporation
+  All rights reserved. This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _CIRRUS_LOGIC_I2C_H_
+#define _CIRRUS_LOGIC_I2C_H_
+
+#include <Protocol/PciIo.h>
+
+/**
+  Read one byte data on I2C Bus.
+
+  Read one byte data from the slave device connectet to I2C Bus.
+  If Data is NULL, then ASSERT().
+
+  @param  PciIo              The pointer to PCI_IO_PROTOCOL.
+  @param  DeviceAddress      Slave device's address.
+  @param  RegisterAddress    The register address on slave device.
+  @param  Data               The pointer to returned data if EFI_SUCCESS returned.
+
+  @retval EFI_DEVICE_ERROR
+  @retval EFI_SUCCESS
+
+**/
+EFI_STATUS
+EFIAPI
+I2cReadByte (
+  EFI_PCI_IO_PROTOCOL    *PciIo,
+  UINT8                  DeviceAddress,
+  UINT8                  RegisterAddress,
+  UINT8                  *Data
+  );
+
+/**
+  Write one byte data onto I2C Bus.
+
+  Write one byte data to the slave device connectet to I2C Bus.
+  If Data is NULL, then ASSERT().
+
+  @param  PciIo              The pointer to PCI_IO_PROTOCOL.
+  @param  DeviceAddress      Slave device's address.
+  @param  RegisterAddress    The register address on slave device.
+  @param  Data               The pointer to write data.
+
+  @retval EFI_DEVICE_ERROR
+  @retval EFI_SUCCESS
+
+**/
+EFI_STATUS
+EFIAPI
+I2cWriteByte (
+  EFI_PCI_IO_PROTOCOL    *PciIo,
+  UINT8                  DeviceAddress,
+  UINT8                  RegisterAddress,
+  UINT8                  *Data
+  );
+
+#endif