Hi Everyone Thanks for the guidance Marvin. A lot of good things and ideas for me to take a look.
One question that I had after starting to take a look at the IntelFspPkg. There are two files that are really close to each other. These: /IntelFspPkg/FspSecCore/Ia32/ResetVec.asm16 /IntelFspPkg/FspSecCore/Vtf0/Ia16/ResetVec.asm16 I tried to find some meaning for this duplicity, but didn't find a reason for this. They are really close to each other. Does anyone know why do we need these two files instead of one ? Maybe some assembly magic that I didn't understand. Thanks and Regards Rafael R. Machado Em seg, 28 de mar de 2016 às 13:11, Marvin Häuser < marvin.haeu...@outlook.com> escreveu: > Hello Rafael, > > Chipset initialization should be done in the PEI phase, along with the > initialization of any critical hardware (DRAM, etc.). In DXE, usually the > optional devices are initialized (controllers like USB and such). Here is a > nice picture of the boot flow from the TianoCore Wiki: > > > https://raw.githubusercontent.com/tianocore/tianocore.github.io/master/images/PI_Boot_Phases.JPG > > For further information, you can check out the Intel Firmware Support > Package Documentation, as I believe that many vendor implementations use > it, its code or at least based their code of the flow described in the > Specification. > > I would suggest that you make your Audio driver an UEFI driver, as DXE > drivers should be primarily used to expose everything needed during the > Boot Services availability (NVRAM, System Reset, Console devices and such). > By the time an UEFI app would run from the disk, audio would be available. > For other drivers using audio, they should install a Protocol Notify hook > to handle the Audio protocol installation. Apple has an HDA driver in their > firmware (used for VoiceOver in their BootPicker and probably OS loader), > in case you want to take a look at how others do it. > > Regards, > Marvin. > > ________________________________________ > Von: edk2-devel <edk2-devel-boun...@lists.01.org> im Auftrag von Rafael > Machado <rafaelrodrigues.mach...@gmail.com> > Gesendet: Montag, 28. März 2016 18:00 > An: edk2-devel@lists.01.org > Betreff: [edk2] Question about Chipset initialization > > Hi everyone. > > I'm doing some studies related to audio at UEFI. To in future enable BIOS > to be accessible. This is part of my MSc in Computer Science degree. It's > take some time, but I'm not worried. The challenge was already accepted. > > Currently I'm checking is the chipset is already enabled correctly at the > point a UEFI application can be executed after DXE phase. > > My questions are: > > What is normally the driver that enable the chipset? > Is it at PEI phase or at DXE phase ? > > To understand the scenario and how things work at this point, I'm doing > some reverse engineering using UEFITool and the framework radare2. Any > other idea about how to proceed with these studies would be appreciated. > > Thanks and Regards > Rafael R. Machado > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.01.org > https://lists.01.org/mailman/listinfo/edk2-devel >
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