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 --------------------------------------------------------------------- Intel Technology Poland sp. z o.o. ul. Slowackiego 173 | 80-298 Gdansk | Sad Rejonowy Gdansk Polnoc | VII Wydzial Gospodarczy Krajowego Rejestru Sadowego - KRS 101882 | NIP 957-07-52-316 | Kapital zakladowy 200.000 PLN. Spolka oswiadcza, ze posiada status duzego przedsiebiorcy w rozumieniu ustawy z dnia 8 marca 2013 r. o przeciwdzialaniu nadmiernym opoznieniom w transakcjach handlowych. Ta wiadomosc wraz z zalacznikami jest przeznaczona dla okreslonego adresata i moze zawierac informacje poufne. W razie przypadkowego otrzymania tej wiadomosci, prosimy o powiadomienie nadawcy oraz trwale jej usuniecie; jakiekolwiek przegladanie lub rozpowszechnianie jest zabronione. This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). If you are not the intended recipient, please contact the sender and delete all copies; any review or distribution by others is strictly prohibited. -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#118643): https://edk2.groups.io/g/devel/message/118643 Mute This Topic: https://groups.io/mt/105959578/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
