Why not implement a customized SerialPortLib and use MdeModulePkg/Universal/SerialDxe/SerialDxe.inf?

Thanks,
Ray

From: Borzeszkowski, Alan <alan.borzeszkowski@intel.com>
Sent: Tuesday, May 7, 2024 21:09
To: devel@edk2.groups.io <devel@edk2.groups.io>
Cc: Borzeszkowski, Alan <alan.borzeszkowski@intel.com>; Gao, Zhichao <zhichao.gao@intel.com>; Ni, Ray <ray.ni@intel.com>; Kinney, Michael D <michael.d.kinney@intel.com>
Subject: [PATCH 1/1] MdeModulePkg: Load Serial driver in early DXE
 
For the purpose of UEFI debug prints enablement in early DXE,
Serial driver should load earlier. To comply with EDK2 specification
and maximize code reuse, new driver entrypoint was created
and separate .inf file was added.

Cc: Zhichao Gao <zhichao.gao@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: Alan Borzeszkowski <alan.borzeszkowski@intel.com>
---
 .../PciSioSerialDxe/PciSioSerialDxeEarly.inf  |  81 ++++++++
 MdeModulePkg/Bus/Pci/PciSioSerialDxe/Serial.c | 184 ++++++++++++++----
 .../Bus/Pci/PciSioSerialDxe/SerialIo.c        |  16 +-
 MdeModulePkg/MdeModulePkg.dsc                 |   1 +
 4 files changed, 245 insertions(+), 37 deletions(-)
 create mode 100644 MdeModulePkg/Bus/Pci/PciSioSerialDxe/PciSioSerialDxeEarly.inf

diff --git a/MdeModulePkg/Bus/Pci/PciSioSerialDxe/PciSioSerialDxeEarly.inf b/MdeModulePkg/Bus/Pci/PciSioSerialDxe/PciSioSerialDxeEarly.inf
new file mode 100644
index 0000000000..1b88f7a1cc
--- /dev/null
+++ b/MdeModulePkg/Bus/Pci/PciSioSerialDxe/PciSioSerialDxeEarly.inf
@@ -0,0 +1,81 @@
+## @file

+# Serial driver for standard UARTS on a SIO chip or PCI/PCIE card.

+#

+# Produces the Serial I/O protocol for standard UARTS using Super I/O or PCI I/O.

+#

+# This is Early DXE version of Serial driver. It's intended use is for debug purposes

+# in early DXE. There is added dependency on either Super I/O Protocol or PCI I/O Protocol.

+#

+# Copyright (c) 2007 - 2024, Intel Corporation. All rights reserved.<BR>

+#

+# SPDX-License-Identifier: BSD-2-Clause-Patent

+#

+##

+

+[Defines]

+  INF_VERSION                    = 0x00010005

+  BASE_NAME                      = PciSioSerialDxeEarly

+  MODULE_UNI_FILE                = PciSioSerialDxe.uni

+  FILE_GUID                      = E47C4BFB-9CCC-47B6-A3C1-79C3FBF8B6C8

+  MODULE_TYPE                    = DXE_DRIVER

+  VERSION_STRING                 = 1.0

+  ENTRY_POINT                    = DxePciSioSerialDriverEntrypoint

+

+#

+# The following information is for reference only and not required by the build tools.

+#

+#  VALID_ARCHITECTURES           = IA32 X64 EBC

+#

+#  DRIVER_BINDING                =  gSerialControllerDriver

+#  COMPONENT_NAME                =  gPciSioSerialComponentName

+#  COMPONENT_NAME2               =  gPciSioSerialComponentName2

+#

+

+[Sources]

+  ComponentName.c

+  SerialIo.c

+  Serial.h

+  Serial.c

+

+[Packages]

+  MdePkg/MdePkg.dec

+  MdeModulePkg/MdeModulePkg.dec

+

+[LibraryClasses]

+  PcdLib

+  ReportStatusCodeLib

+  UefiBootServicesTableLib

+  MemoryAllocationLib

+  BaseMemoryLib

+  DevicePathLib

+  UefiLib

+  UefiDriverEntryPoint

+  DebugLib

+  IoLib

+

+[Guids]

+  gEfiUartDevicePathGuid                        ## SOMETIMES_CONSUMES   ## GUID

+

+[Protocols]

+  gEfiSioProtocolGuid                           ## TO_START

+  gEfiDevicePathProtocolGuid                    ## TO_START

+  gEfiPciIoProtocolGuid                         ## TO_START

+  gEfiSerialIoProtocolGuid                      ## BY_START

+  gEfiDevicePathProtocolGuid                    ## BY_START

+

+[FeaturePcd]

+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialUseHalfHandshake|FALSE   ## CONSUMES

+

+[Pcd]

+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultBaudRate|115200    ## CONSUMES

+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultDataBits|8         ## CONSUMES

+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultParity|1           ## CONSUMES

+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultStopBits|1         ## CONSUMES

+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialClockRate|1843200 ## CONSUMES

+  gEfiMdeModulePkgTokenSpaceGuid.PcdPciSerialParameters     ## CONSUMES

+

+[UserExtensions.TianoCore."ExtraFiles"]

+  PciSioSerialDxeExtra.uni

+

+[Depex]

+  gEfiSioProtocolGuid OR gEfiPciIoProtocolGuid

diff --git a/MdeModulePkg/Bus/Pci/PciSioSerialDxe/Serial.c b/MdeModulePkg/Bus/Pci/PciSioSerialDxe/Serial.c
index 8b1ce70118..cc77d12748 100644
--- a/MdeModulePkg/Bus/Pci/PciSioSerialDxe/Serial.c
+++ b/MdeModulePkg/Bus/Pci/PciSioSerialDxe/Serial.c
@@ -156,6 +156,7 @@ InitializePciSioSerial (
 /**

   Return whether the controller is a SIO serial controller.

 

+  @param  This         A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.

   @param  Controller   The controller handle.

 

   @retval EFI_SUCCESS  The controller is a SIO serial controller.

@@ -163,7 +164,8 @@ InitializePciSioSerial (
 **/

 EFI_STATUS

 IsSioSerialController (

-  EFI_HANDLE  Controller

+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,

+  EFI_HANDLE                      Controller

   )

 {

   EFI_STATUS                Status;

@@ -178,7 +180,7 @@ IsSioSerialController (
                   Controller,

                   &gEfiSioProtocolGuid,

                   (VOID **)&Sio,

-                  gSerialControllerDriver.DriverBindingHandle,

+                  This->DriverBindingHandle,

                   Controller,

                   EFI_OPEN_PROTOCOL_BY_DRIVER

                   );

@@ -193,7 +195,7 @@ IsSioSerialController (
     gBS->CloseProtocol (

            Controller,

            &gEfiSioProtocolGuid,

-           gSerialControllerDriver.DriverBindingHandle,

+           This->DriverBindingHandle,

            Controller

            );

 

@@ -201,7 +203,7 @@ IsSioSerialController (
                     Controller,

                     &gEfiDevicePathProtocolGuid,

                     (VOID **)&DevicePath,

-                    gSerialControllerDriver.DriverBindingHandle,

+                    This->DriverBindingHandle,

                     Controller,

                     EFI_OPEN_PROTOCOL_BY_DRIVER

                     );

@@ -228,7 +230,7 @@ IsSioSerialController (
     gBS->CloseProtocol (

            Controller,

            &gEfiDevicePathProtocolGuid,

-           gSerialControllerDriver.DriverBindingHandle,

+           This->DriverBindingHandle,

            Controller

            );

   }

@@ -239,14 +241,16 @@ IsSioSerialController (
 /**

   Return whether the controller is a PCI serial controller.

 

-  @param  Controller   The controller handle.

+  @param  This            A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.

+  @param  Controller      The controller handle.

 

   @retval EFI_SUCCESS  The controller is a PCI serial controller.

   @retval others       The controller is not a PCI serial controller.

 **/

 EFI_STATUS

 IsPciSerialController (

-  EFI_HANDLE  Controller

+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,

+  EFI_HANDLE                      Controller

   )

 {

   EFI_STATUS                Status;

@@ -262,7 +266,7 @@ IsPciSerialController (
                   Controller,

                   &gEfiPciIoProtocolGuid,

                   (VOID **)&PciIo,

-                  gSerialControllerDriver.DriverBindingHandle,

+                  This->DriverBindingHandle,

                   Controller,

                   EFI_OPEN_PROTOCOL_BY_DRIVER

                   );

@@ -301,7 +305,7 @@ IsPciSerialController (
     gBS->CloseProtocol (

            Controller,

            &gEfiPciIoProtocolGuid,

-           gSerialControllerDriver.DriverBindingHandle,

+           This->DriverBindingHandle,

            Controller

            );

   }

@@ -317,7 +321,7 @@ IsPciSerialController (
                   Controller,

                   &gEfiDevicePathProtocolGuid,

                   (VOID **)&DevicePath,

-                  gSerialControllerDriver.DriverBindingHandle,

+                  This->DriverBindingHandle,

                   Controller,

                   EFI_OPEN_PROTOCOL_BY_DRIVER

                   );

@@ -329,7 +333,7 @@ IsPciSerialController (
   gBS->CloseProtocol (

          Controller,

          &gEfiDevicePathProtocolGuid,

-         gSerialControllerDriver.DriverBindingHandle,

+         This->DriverBindingHandle,

          Controller

          );

 

@@ -348,12 +352,11 @@ IsPciSerialController (
 **/

 EFI_STATUS

 EFIAPI

-SerialControllerDriverSupported (

+SerialDriverSupported (

   IN EFI_DRIVER_BINDING_PROTOCOL  *This,

   IN EFI_HANDLE                   Controller,

   IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath

   )

-

 {

   EFI_STATUS                     Status;

   UART_DEVICE_PATH               *Uart;

@@ -393,17 +396,40 @@ SerialControllerDriverSupported (
     }

   }

 

-  Status = IsSioSerialController (Controller);

+  Status = IsSioSerialController (This, Controller);

   if (EFI_ERROR (Status)) {

-    Status = IsPciSerialController (Controller);

+    Status = IsPciSerialController (This, Controller);

   }

 

   return Status;

 }

 

+/**

+  Check to see if this driver supports the given controller

+

+  @param  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.

+  @param  Controller           The handle of the controller to test.

+  @param  RemainingDevicePath  A pointer to the remaining portion of a device path.

+

+  @return EFI_SUCCESS          This driver can support the given controller

+

+**/

+EFI_STATUS

+EFIAPI

+SerialControllerDriverSupported (

+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,

+  IN EFI_HANDLE                   Controller,

+  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath

+  )

+

+{

+  return SerialDriverSupported (This, Controller, RemainingDevicePath);

+}

+

 /**

   Create the child serial device instance.

 

+  @param  This                A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.

   @param Controller           The parent controller handle.

   @param Uart                 Pointer to the UART device path node in RemainingDevicePath,

                               or NULL if RemainingDevicePath is NULL.

@@ -423,14 +449,15 @@ SerialControllerDriverSupported (
 **/

 EFI_STATUS

 CreateSerialDevice (

-  IN EFI_HANDLE                Controller,

-  IN UART_DEVICE_PATH          *Uart,

-  IN EFI_DEVICE_PATH_PROTOCOL  *ParentDevicePath,

-  IN BOOLEAN                   CreateControllerNode,

-  IN UINT32                    Instance,

-  IN PARENT_IO_PROTOCOL_PTR    ParentIo,

-  IN PCI_SERIAL_PARAMETER      *PciSerialParameter  OPTIONAL,

-  IN PCI_DEVICE_INFO           *PciDeviceInfo       OPTIONAL

+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,

+  IN EFI_HANDLE                   Controller,

+  IN UART_DEVICE_PATH             *Uart,

+  IN EFI_DEVICE_PATH_PROTOCOL     *ParentDevicePath,

+  IN BOOLEAN                      CreateControllerNode,

+  IN UINT32                       Instance,

+  IN PARENT_IO_PROTOCOL_PTR       ParentIo,

+  IN PCI_SERIAL_PARAMETER         *PciSerialParameter  OPTIONAL,

+  IN PCI_DEVICE_INFO              *PciDeviceInfo       OPTIONAL

   )

 {

   EFI_STATUS                                  Status;

@@ -685,7 +712,7 @@ CreateSerialDevice (
                   Controller,

                   PciSerialParameter != NULL ? &gEfiPciIoProtocolGuid : &gEfiSioProtocolGuid,

                   (VOID **)&ParentIo,

-                  gSerialControllerDriver.DriverBindingHandle,

+                  This->DriverBindingHandle,

                   SerialDevice->Handle,

                   EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER

                   );

@@ -720,6 +747,7 @@ CreateError:
 /**

   Returns an array of pointers containing all the child serial device pointers.

 

+  @param  This           A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.

   @param Controller      The parent controller handle.

   @param IoProtocolGuid  The protocol GUID, either equals to gEfiSioProtocolGuid

                          or equals to gEfiPciIoProtocolGuid.

@@ -729,9 +757,10 @@ CreateError:
 **/

 SERIAL_DEV **

 GetChildSerialDevices (

-  IN EFI_HANDLE  Controller,

-  IN EFI_GUID    *IoProtocolGuid,

-  OUT UINTN      *Count

+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,

+  IN EFI_HANDLE                   Controller,

+  IN EFI_GUID                     *IoProtocolGuid,

+  OUT UINTN                       *Count

   )

 {

   EFI_STATUS                           Status;

@@ -768,7 +797,7 @@ GetChildSerialDevices (
                       OpenInfoBuffer[Index].ControllerHandle,

                       &gEfiSerialIoProtocolGuid,

                       (VOID **)&SerialIo,

-                      gSerialControllerDriver.DriverBindingHandle,

+                      This->DriverBindingHandle,

                       Controller,

                       EFI_OPEN_PROTOCOL_GET_PROTOCOL

                       );

@@ -778,7 +807,7 @@ GetChildSerialDevices (
     }

 

     if ((OpenInfoBuffer[Index].Attributes & EFI_OPEN_PROTOCOL_BY_DRIVER) != 0) {

-      ASSERT (OpenInfoBuffer[Index].AgentHandle == gSerialControllerDriver.DriverBindingHandle);

+      ASSERT (OpenInfoBuffer[Index].AgentHandle == This->DriverBindingHandle);

       OpenByDriver = TRUE;

     }

   }

@@ -793,7 +822,7 @@ GetChildSerialDevices (
 }

 

 /**

-  Start to management the controller passed in

+  Start to manage the controller passed in

 

   @param  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.

   @param  Controller           The handle of the controller to test.

@@ -803,7 +832,7 @@ GetChildSerialDevices (
 **/

 EFI_STATUS

 EFIAPI

-SerialControllerDriverStart (

+SerialDriverStart (

   IN EFI_DRIVER_BINDING_PROTOCOL  *This,

   IN EFI_HANDLE                   Controller,

   IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath

@@ -890,7 +919,7 @@ SerialControllerDriverStart (
 

   ControllerNumber       = 0;

   ContainsControllerNode = FALSE;

-  SerialDevices          = GetChildSerialDevices (Controller, IoProtocolGuid, &SerialDeviceCount);

+  SerialDevices          = GetChildSerialDevices (This, Controller, IoProtocolGuid, &SerialDeviceCount);

 

   if (SerialDeviceCount != 0) {

     if (RemainingDevicePath == NULL) {

@@ -991,7 +1020,7 @@ SerialControllerDriverStart (
         Node = NextDevicePathNode (Node);

       } while (!IsDevicePathEnd (Node));

 

-      Status = CreateSerialDevice (Controller, Uart, ParentDevicePath, FALSE, Acpi->UID, ParentIo, NULL, NULL);

+      Status = CreateSerialDevice (This, Controller, Uart, ParentDevicePath, FALSE, Acpi->UID, ParentIo, NULL, NULL);

       DEBUG ((DEBUG_INFO, "PciSioSerial: Create SIO child serial device - %r\n", Status));

     }

   } else {

@@ -1073,7 +1102,7 @@ SerialControllerDriverStart (
             PciSerialParameter = PcdGetPtr (PcdPciSerialParameters);

           }

 

-          Status = CreateSerialDevice (Controller, Uart, ParentDevicePath, FALSE, 0, ParentIo, PciSerialParameter, PciDeviceInfo);

+          Status = CreateSerialDevice (This, Controller, Uart, ParentDevicePath, FALSE, 0, ParentIo, PciSerialParameter, PciDeviceInfo);

           DEBUG ((DEBUG_INFO, "PciSioSerial: Create PCI child serial device (single) - %r\n", Status));

           if (!EFI_ERROR (Status)) {

             PciDeviceInfo->ChildCount++;

@@ -1094,7 +1123,7 @@ SerialControllerDriverStart (
               //

               // Create controller node when PCI serial device contains multiple UARTs

               //

-              Status = CreateSerialDevice (Controller, Uart, ParentDevicePath, TRUE, PciSerialCount, ParentIo, PciSerialParameter, PciDeviceInfo);

+              Status = CreateSerialDevice (This, Controller, Uart, ParentDevicePath, TRUE, PciSerialCount, ParentIo, PciSerialParameter, PciDeviceInfo);

               PciSerialCount++;

               DEBUG ((DEBUG_INFO, "PciSioSerial: Create PCI child serial device (multiple) - %r\n", Status));

               if (!EFI_ERROR (Status)) {

@@ -1147,6 +1176,91 @@ SerialControllerDriverStart (
   return Status;

 }

 

+/**

+  Start to manage the controller passed in

+

+  @param  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.

+  @param  Controller           The handle of the controller to test.

+  @param  RemainingDevicePath  A pointer to the remaining portion of a device path.

+

+  @return EFI_SUCCESS   Driver is started successfully

+**/

+EFI_STATUS

+EFIAPI

+SerialControllerDriverStart (

+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,

+  IN EFI_HANDLE                   Controller,

+  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath

+  )

+{

+  return SerialDriverStart (This, Controller, RemainingDevicePath);

+}

+

+/**

+  Initialize Serial driver in DXE phase

+

+  @param ImageHandle  Handle for the image of this driver.

+  @param SystemTable  Pointer to the EFI System Table.

+

+  @return EFI_SUCCESS   Driver is started successfully

+**/

+EFI_STATUS

+EFIAPI

+DxePciSioSerialDriverEntrypoint (

+  IN EFI_HANDLE        ImageHandle,

+  IN EFI_SYSTEM_TABLE  *SystemTable

+  )

+{

+  EFI_STATUS                   Status;

+  EFI_DEVICE_PATH_PROTOCOL     *EfiDevicePath;

+  EFI_HANDLE                   *HandleBuffer;

+  UINTN                        NumberOfHandles;

+  EFI_DRIVER_BINDING_PROTOCOL  *SerialControllerDriver;

+  UINTN                        Index;

+

+  EfiDevicePath = NULL;

+  HandleBuffer  = NULL;

+  //

+  // Initialize the serial controller instance

+  //

+  SerialControllerDriver = AllocateCopyPool (sizeof (EFI_DRIVER_BINDING_PROTOCOL), &gSerialControllerDriver);

+  ASSERT (SerialControllerDriver != NULL);

+

+  SerialControllerDriver->DriverBindingHandle = ImageHandle;

+  //

+  // Initialize UART default setting in gSerialDevTemplate

+  //

+  gSerialDevTemplate.SerialMode.BaudRate     = PcdGet64 (PcdUartDefaultBaudRate);

+  gSerialDevTemplate.SerialMode.DataBits     = PcdGet8 (PcdUartDefaultDataBits);

+  gSerialDevTemplate.SerialMode.Parity       = PcdGet8 (PcdUartDefaultParity);

+  gSerialDevTemplate.SerialMode.StopBits     = PcdGet8 (PcdUartDefaultStopBits);

+  gSerialDevTemplate.UartDevicePath.BaudRate = PcdGet64 (PcdUartDefaultBaudRate);

+  gSerialDevTemplate.UartDevicePath.DataBits = PcdGet8 (PcdUartDefaultDataBits);

+  gSerialDevTemplate.UartDevicePath.Parity   = PcdGet8 (PcdUartDefaultParity);

+  gSerialDevTemplate.UartDevicePath.StopBits = PcdGet8 (PcdUartDefaultStopBits);

+  gSerialDevTemplate.ClockRate               = PcdGet32 (PcdSerialClockRate);

+

+  // Check all handles for compatible Device Path and appropriate I/O Protocol

+  Status = gBS->LocateHandleBuffer (ByProtocol, &gEfiDevicePathProtocolGuid, NULL, &NumberOfHandles, &HandleBuffer);

+  if (EFI_ERROR (Status)) {

+    return Status;

+  }

+

+  for (Index = 0; Index < NumberOfHandles; Index++) {

+    EfiDevicePath = DevicePathFromHandle (HandleBuffer[Index]);

+    Status        = SerialDriverSupported (SerialControllerDriver, HandleBuffer[Index], EfiDevicePath);

+    DEBUG ((DEBUG_INFO, "SerialDriverSupported status: %r\n", Status));

+    if (EFI_ERROR (Status)) {

+      continue;

+    }

+

+    Status = SerialDriverStart (SerialControllerDriver, HandleBuffer[Index], EfiDevicePath);

+    DEBUG ((DEBUG_INFO, "SerialDriverStart status: %r\n", Status));

+  }

+

+  return EFI_SUCCESS;

+}

+

 /**

   Disconnect this driver with the controller, uninstall related protocol instance

 

diff --git a/MdeModulePkg/Bus/Pci/PciSioSerialDxe/SerialIo.c b/MdeModulePkg/Bus/Pci/PciSioSerialDxe/SerialIo.c
index 8a85a6c3b8..c052d43b84 100644
--- a/MdeModulePkg/Bus/Pci/PciSioSerialDxe/SerialIo.c
+++ b/MdeModulePkg/Bus/Pci/PciSioSerialDxe/SerialIo.c
@@ -1367,7 +1367,13 @@ SerialReadRegister (
   EFI_STATUS  Status;

 

   if (SerialDev->PciDeviceInfo == NULL) {

-    return IoRead8 ((UINTN)SerialDev->BaseAddress + Offset * SerialDev->RegisterStride);

+    if (SerialDev->MmioAccess)

+    {

+      return MmioRead8((UINTN)SerialDev->BaseAddress + Offset * SerialDev->RegisterStride);

+    }

+    else {

+      return IoRead8 ((UINTN)SerialDev->BaseAddress + Offset * SerialDev->RegisterStride);

+    }

   } else {

     if (SerialDev->MmioAccess) {

       Status = SerialDev->PciDeviceInfo->PciIo->Mem.Read (

@@ -1411,7 +1417,13 @@ SerialWriteRegister (
   EFI_STATUS  Status;

 

   if (SerialDev->PciDeviceInfo == NULL) {

-    IoWrite8 ((UINTN)SerialDev->BaseAddress + Offset * SerialDev->RegisterStride, Data);

+    if (SerialDev->MmioAccess)

+    {

+      MmioWrite8((UINTN)SerialDev->BaseAddress + Offset * SerialDev->RegisterStride, Data);

+    }

+    else {

+      IoWrite8 ((UINTN)SerialDev->BaseAddress + Offset * SerialDev->RegisterStride, Data);

+    }

   } else {

     if (SerialDev->MmioAccess) {

       Status = SerialDev->PciDeviceInfo->PciIo->Mem.Write (

diff --git a/MdeModulePkg/MdeModulePkg.dsc b/MdeModulePkg/MdeModulePkg.dsc
index c0f1df3bfb..b209fe2696 100644
--- a/MdeModulePkg/MdeModulePkg.dsc
+++ b/MdeModulePkg/MdeModulePkg.dsc
@@ -240,6 +240,7 @@
 

   MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe.inf

   MdeModulePkg/Bus/Pci/PciSioSerialDxe/PciSioSerialDxe.inf

+  MdeModulePkg/Bus/Pci/PciSioSerialDxe/PciSioSerialDxeEarly.inf

   MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf

   MdeModulePkg/Bus/Pci/IncompatiblePciDeviceSupportDxe/IncompatiblePciDeviceSupportDxe.inf

   MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressDxe.inf

--
2.34.1

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