Re: how to load drivers from additional FV's?

[Andrew Fish <afish@apple.com>]

> On Mar 15, 2017, at 5:23 AM, Michael Zimmermann <sigmaepsilon92@gmail.com> wrote:
> 
> I'm trying to add another FV section FVMAIN_COMPACT so I can keep
> Platform specific drivers in a separate, included fdf.
> 
> I did this:
>  FILE FV_IMAGE = 9E21FD93-9C72-4c15-8C4B-E77F1DB2D792 {
>    SECTION GUIDED EE4E5898-3914-4259-9D6E-DC7BD79403CF
> PROCESSING_REQUIRED = TRUE {
>      SECTION FV_IMAGE = FVMAIN
>      SECTION FV_IMAGE = FVMAINPLATFORM
>    }
>  }
> 
> The image builds file and using uefitool I can verify that the new FV
> is inside the compressed section.
> But none of the drivers gets discovered/loaded and I get 'Protocol not
> present!!' errors.
> 

Michael,

This looks like an implementation restriction. Please file a bug.

CoreProcessFvImageFile() will only grab the 1st instance (hard coded to 0) of EFI_SECTION_FIRMWARE_VOLUME_IMAGE and your example has 2 sections. 

Maybe the CoreProcessFvImageFile() should loop on instance. I assume the device path will be OK, but some one should check on that. 
https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Core/Dxe/Dispatcher/Dispatcher.c#L975


  //
  // Read the first (and only the first) firmware volume section
  //
  SectionType   = EFI_SECTION_FIRMWARE_VOLUME_IMAGE;
  FvHeader      = NULL;
  FvAlignment   = 0;
  Buffer        = NULL;
  BufferSize    = 0;
  AlignedBuffer = NULL;
  Status = Fv->ReadSection (
                 Fv,
                 DriverName,
                 SectionType,
                 0,
                 &Buffer,
                 &BufferSize,
                 &AuthenticationStatus
                 );



Thanks,

Andrew Fish

> Thanks
> Michael
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