csm on edk2-platform

[tommaso.mazzoni@engicam.com]

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Dear all,

Dear David Woodhouse,

I'm trying to add Csm packages to my edk2-platform (based on 
devel-IntelAtomProcessorE3900 branch). I customized the repository to 
fit a custom module based on Apollo Lake CPU.

edk2 is the UDK2018 branch.

I generated Csm16.bin with David Woodhouse SeaBios 
(git://git.infradead.org/users/dwmw2/seabios.git).

Then I updated LegacyBbs.c in LegacyBiosDxe.inf because edk2-UDK2018 
version supports only Floppy and IDE HDD. I used LegacyBbs.c from 
edk2-master to scan also removable devices.

Now I can scan removable devices and Boot Manager populate the boot list 
with Legacy options, even it calls all options "Harddisk".

So I can try to boot it but the boot procedure stacks when it try to 
disconnect EFI devices (in PciShadowRoms function of LegacyPci.c). 
Function starts to disconnect from VGA, at that point boot stacks.

My dsc file contains the following includes:

    MdeModulePkg/Universal/BdsDxe/BdsDxe.inf {
         <LibraryClasses>
    !ifdef $(CSM_ENABLE)
           NULL|OvmfPkg/Csm/CsmSupportLib/CsmSupportLib.inf
    NULL|IntelFrameworkModulePkg/Library/LegacyBootManagerLib/LegacyBootManagerLib.inf
    !endif
       }
    MdeModulePkg/Application/BootManagerMenuApp/BootManagerMenuApp.inf {
         <LibraryClasses>
    DebugLib|MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf
         }
       MdeModulePkg/Application/UiApp/UiApp.inf {
         <LibraryClasses>
    NULL|MdeModulePkg/Library/DeviceManagerUiLib/DeviceManagerUiLib.inf
    NULL|MdeModulePkg/Library/BootManagerUiLib/BootManagerUiLib.inf
    NULL|MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootMaintenanceManagerUiLib.inf
    !ifdef $(CSM_ENABLE)
    NULL|IntelFrameworkModulePkg/Library/LegacyBootManagerLib/LegacyBootManagerLib.inf
    NULL|IntelFrameworkModulePkg/Library/LegacyBootMaintUiLib/LegacyBootMaintUiLib.inf
    !endif
       }

and:

    !ifdef $(CSM_ENABLE)

    IntelFrameworkModulePkg/Csm/BiosThunk/KeyboardDxe/KeyboardDxe.inf

    IntelFrameworkModulePkg/Csm/BiosThunk/VideoDxe/VideoDxe.inf

    IntelFrameworkModulePkg/Csm/BiosThunk/BlockIoDxe/BlockIoDxe.inf

    IntelFrameworkModulePkg/Csm/BiosThunk/Snp16Dxe/Snp16Dxe.inf

    IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosDxe.inf

    OvmfPkg/Csm/Csm16/Csm16.inf

    !endif

I try to replicate what Laszlo suggest in 
https://ml01.01.org/hyperkitty/list/edk2-devel@lists.01.org/thread/AT7EWPIOJ3GUPBAHIDZLR5V5ZK5S442K/

Do you have any suggestions? Do you understand what is happening?

Thank you.

Best regards,


-- 
Tommaso Mazzoni
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