This is a UEFI Driver that depends on the Driver Binding Protocol and use of ConnectController(). These drivers cannot be used until the BDS phase when the active consoles and boot devices are evaluated and the smallest set of drivers required to boot are connected.
It does not make sense to have a UEFI Driver active in early DXE because it will not be connected yet and has dependencies on other UEFI drivers that will not be connected yet. Did you consider the use of the SerialPortLib for early DXE that can use PCI serial devices with PcdSerialPciDeviceInfo that can be used for DEBUG() messages. The other option is to map the PCI UART into Report Status Code. Best regards, Mike > -----Original Message----- > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of > Borzeszkowski, Alan > Sent: Tuesday, February 20, 2024 4:11 AM > To: devel@edk2.groups.io > Cc: Albecki, Mateusz <mateusz.albe...@intel.com>; Gao, Zhichao > <zhichao....@intel.com>; Ni, Ray <ray...@intel.com>; Borzeszkowski, > Alan <alan.borzeszkow...@intel.com> > Subject: [edk2-devel] [PATCH 1/1] MdeModulePkg: Load Serial driver > earlier in DXE > > For the purpose of UEFI debug prints enablement in DXE phase, > Serial driver should load earlier. Separate .inf file is created > in order to make minimal changes to current implementation. > > Signed-off-by: Alan Borzeszkowski <alan.borzeszkow...@intel.com> > --- > .../PciSioSerialDxe/PciSioSerialDxeEarly.inf | 80 +++++++++++++++++++ > 1 file changed, 80 insertions(+) > 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..2ead654898 > --- /dev/null > +++ b/MdeModulePkg/Bus/Pci/PciSioSerialDxe/PciSioSerialDxeEarly.inf > @@ -0,0 +1,80 @@ > +## @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 version is used shortly after DXE Core is invoked > +# > +# Copyright (c) 2007 - 2018, 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 = 8BCC425E-585F-4E66-ADA5- > FEA9A635F911 > + MODULE_TYPE = DXE_DRIVER > + VERSION_STRING = 1.0 > + ENTRY_POINT = InitializePciSioSerial > + > +# > +# 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 > + SerialIoCommon.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] > + TRUE > -- > 2.34.1 > > --------------------------------------------------------------------- > Intel Technology Poland sp. z o.o. > ul. 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