Hello Guo,
FSP wrapper and Coreboot are bootloaders consuming FSP binary. 

FSP must get called Post PCI bus enumeration to do the required silicon 
initialization. Why do we need a PCD to skip it?

Thanks,
-Giri

> -----Original Message-----
> From: Dong, Guo
> Sent: Monday, October 17, 2016 3:53 PM
> To: edk2-devel@lists.01.org
> Cc: Yao, Jiewen <jiewen....@intel.com>; Mudusuru, Giri P
> <giri.p.mudus...@intel.com>; Dong, Guo <guo.d...@intel.com>
> Subject: [edk2] [PATCH] IntelFsp2WrapperPkg: Add a PCD to control if signaling
> first event.
> 
> PciEnumerationComplete might be signaled to FSP in Coreboot. Add a
> PCD PcdNotifyPciEnumerationComplete so FspWrapperNotifyDxe driver
> could be used in this case.
> 
> Contributed-under: TianoCore Contribution Agreement 1.0
> Signed-off-by: gdong1 <guo.d...@intel.com>
> ---
>  .../FspWrapperNotifyDxe/FspWrapperNotifyDxe.c          | 18 
> ++++++++++--------
>  .../FspWrapperNotifyDxe/FspWrapperNotifyDxe.inf        |  3 ++-
>  IntelFsp2WrapperPkg/IntelFsp2WrapperPkg.dec            |  5 +++++
>  3 files changed, 17 insertions(+), 9 deletions(-)
> 
> diff --git a/IntelFsp2WrapperPkg/FspWrapperNotifyDxe/FspWrapperNotifyDxe.c
> b/IntelFsp2WrapperPkg/FspWrapperNotifyDxe/FspWrapperNotifyDxe.c
> index 0797f44..45eae4b 100644
> --- a/IntelFsp2WrapperPkg/FspWrapperNotifyDxe/FspWrapperNotifyDxe.c
> +++ b/IntelFsp2WrapperPkg/FspWrapperNotifyDxe/FspWrapperNotifyDxe.c
> @@ -246,14 +246,16 @@ FspWrapperNotifyDxeEntryPoint (
>      return EFI_SUCCESS;
>    }
> 
> -  ProtocolNotifyEvent = EfiCreateProtocolNotifyEvent (
> -                          &gEfiPciEnumerationCompleteProtocolGuid,
> -                          TPL_CALLBACK,
> -                          OnPciEnumerationComplete,
> -                          NULL,
> -                          &Registration
> -                          );
> -  ASSERT (ProtocolNotifyEvent != NULL);
> +  if (PcdGetBool(PcdNotifyPciEnumerationComplete)) {
> +    ProtocolNotifyEvent = EfiCreateProtocolNotifyEvent (
> +                            &gEfiPciEnumerationCompleteProtocolGuid,
> +                            TPL_CALLBACK,
> +                            OnPciEnumerationComplete,
> +                            NULL,
> +                            &Registration
> +                            );
> +    ASSERT (ProtocolNotifyEvent != NULL);
> +  }
> 
>    Status = EfiCreateEventReadyToBootEx (
>               TPL_CALLBACK,
> diff --git
> a/IntelFsp2WrapperPkg/FspWrapperNotifyDxe/FspWrapperNotifyDxe.inf
> b/IntelFsp2WrapperPkg/FspWrapperNotifyDxe/FspWrapperNotifyDxe.inf
> index f851f68..f28356d 100644
> --- a/IntelFsp2WrapperPkg/FspWrapperNotifyDxe/FspWrapperNotifyDxe.inf
> +++ b/IntelFsp2WrapperPkg/FspWrapperNotifyDxe/FspWrapperNotifyDxe.inf
> @@ -61,7 +61,8 @@
>    gFspHobGuid                                       ## CONSUMES ## HOB
> 
>  [Pcd]
> -  gIntelFsp2WrapperTokenSpaceGuid.PcdFspsBaseAddress  ## CONSUMES
> +  gIntelFsp2WrapperTokenSpaceGuid.PcdFspsBaseAddress               ##
> CONSUMES
> +  gIntelFsp2WrapperTokenSpaceGuid.PcdNotifyPciEnumerationComplete  ##
> CONSUMES
> 
>  [Depex]
>    TRUE
> diff --git a/IntelFsp2WrapperPkg/IntelFsp2WrapperPkg.dec
> b/IntelFsp2WrapperPkg/IntelFsp2WrapperPkg.dec
> index d9d2d80..52ed9d8 100644
> --- a/IntelFsp2WrapperPkg/IntelFsp2WrapperPkg.dec
> +++ b/IntelFsp2WrapperPkg/IntelFsp2WrapperPkg.dec
> @@ -74,6 +74,11 @@
>    ## This is the base address of FSP-T/M/S
> 
> gIntelFsp2WrapperTokenSpaceGuid.PcdFsptBaseAddress|0x00000000|UINT32|
> 0x00000300
> 
> gIntelFsp2WrapperTokenSpaceGuid.PcdFspmBaseAddress|0x00000000|UINT32
> |0x00000301
> +  ## Indicates if the FSP wrapper will notify FSP
> PciEnumerationComplete.<BR><BR>
> +  #   TRUE  - FSP wrapper will notify PciEnumerationComplete to FSP.<BR>
> +  #   FALSE - FSP wrapper will NOT notify PciEnumerationComplete to FSP.<BR>
> +  # @Prompt Notify FSP PciEnumerationComplete.
> +
> gIntelFsp2WrapperTokenSpaceGuid.PcdNotifyPciEnumerationComplete|TRUE|
> BOOLEAN|0x40000009
> 
>  [PcdsFixedAtBuild, PcdsPatchableInModule,PcdsDynamic,PcdsDynamicEx]
> 
> gIntelFsp2WrapperTokenSpaceGuid.PcdFspsBaseAddress|0x00000000|UINT32|
> 0x00001001
> --
> 2.7.0.windows.1

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