PR created - https://github.com/tianocore/edk2/pull/5513

LGTM but I can't check it against UPL.

@Dong, Guo <guo.dong@intel.com> Would you be able to take a look please'?

On Wed, 4 Oct 2023 at 21:02, MrChromebox <matt.devillier@gmail.com> wrote:

> Fixes serial output on platforms using coreboot and a non-default
> clock rate such as AMD Picasso and newer Zen-based platforms.
>
> Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
> Change-Id: I91290397852176754e9a34ec6e5829044f41d15a
> ---
>  UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c   | 5 +++++
>  UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf | 1 +
>  2 files changed, 6 insertions(+)
>
> diff --git a/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c
> b/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c
> index 60a17b8fc2..e3d47ac2fa 100644
> --- a/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c
> +++ b/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c
> @@ -90,6 +90,11 @@ PlatformHookSerialPortInitialize (
>        return Status;
>      }
>
> +    Status = PcdSet32S (PcdSerialClockRate, SerialPortInfo->ClockRate);
> +    if (RETURN_ERROR (Status)) {
> +      return Status;
> +    }
> +
>      return RETURN_SUCCESS;
>    }
>
> diff --git a/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf
> b/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf
> index 7ac6bfa1b1..e2908cfbca 100644
> --- a/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf
> +++ b/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf
> @@ -38,3 +38,4 @@
>    gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterBase    ## PRODUCES
>    gEfiMdeModulePkgTokenSpaceGuid.PcdSerialBaudRate        ## PRODUCES
>    gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterStride  ## PRODUCES
> +  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialClockRate       ## PRODUCES
> --
> 2.34.1
>
>
>
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