[edk2-devel] [PATCH 0/1] MdeModulePkg: Load Serial driver in early DXE

["Borzeszkowski, Alan" <alan.borzeszkowski@intel.com>]

On Intel platforms, we use LPSS UART for debug prints in DXE phase. Current implementation involves using custom driver.
In order to reduce code maintenance cost and flash usage, we want to switch to EDK2 Serial driver.
Given that PciSioSerialDxe is a UEFI driver and for purposes of loading this driver in early DXE,
new driver entrypoint with separate .inf file was added. This way, Serial driver can be treated as DXE driver.
Also, several smaller changes were made in Serial.c and SerialIo.c to enable debug prints.

Change was tested on Intel platform, debug prints appeared shortly after DXE phase begun.
https://github.com/tianocore/edk2/pull/5542

Alan Borzeszkowski (1):
  MdeModulePkg: Load Serial driver in early DXE

 .../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

-- 
2.34.1

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