Re: [PATCH V2 1/1] UefiPayloadPkg: Remove PEI phase from Payload

Patrick Rudolph

Modifying the bootloader and defining an interface could take a while
and requires to add code that's already present in EDK2.
Would it be possible to move the Tcg*Pei code to a Library, so that it
could be directly used by BlSupportDxe in order to set the PCDs?

Kind Regards,
Patrick Rudolph

On Wed, Jan 27, 2021 at 5:10 PM Dong, Guo <> wrote:

Hi Patrick,
Bootloader (coreboot or Slim Bootloader) is similar with EDKII PEI, so measured boot should
work without PEI phase in UEFI payload.
In general, bootloader need pass required information to UEFI payload.
BlSupportDxe could get these information and set required PCDs.

We need well define the interface with bootloader on how to support measured boot,
Also including measured boot enable/disable, TPM log event, etc.

> -----Original Message-----
> From: <> On Behalf Of Patrick
> Rudolph
> Sent: Tuesday, January 26, 2021 8:21
> To: Dong, Guo <>
> Cc: You, Benjamin <>;; Ma,
> Maurice <>
> Subject: Re: [edk2-devel] [PATCH V2 1/1] UefiPayloadPkg: Remove PEI phase
> from Payload
> Hi,
> I'm trying to rebase my TPM support patches for UefiPayloadPkg on top of
> master.
> The Tcg*Dxe needs the following PCDs set by their Tcg*Pei counterparts:
> * PcdTpm2HashMask
> * PcdTcg2HashAlgorithmBitmap
> * PcdTpmInstanceGuid
> As there's no PEI stage any more, how do you plan to support TPMs in
> UefiPayloadPkg?
> Kind Regards,
> Patrick Rudolph

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