Re: [edk2][PATCH v2 1/2] MdeModulePkg: PcdAcpiExposedTableVersions default for Arm64 platforms

["Wu, Hao A" <hao.a.wu@intel.com>]

> -----Original Message-----
> From: Samer El-Haj-Mahmoud [mailto:samer@elhajmahmoud.com]
> Sent: Friday, April 10, 2020 11:29 PM
> To: devel@edk2.groups.io
> Cc: Bi, Dandan; Gao, Liming; Wang, Jian J; Wu, Hao A; Leif Lindholm; Ard
> Biesheuvel
> Subject: [edk2][PATCH v2 1/2] MdeModulePkg:
> PcdAcpiExposedTableVersions default for Arm64 platforms
> 
> Set the default value of PcdAcpiExposedTableVersions for Aarch64
> platforms to 0x20. Previously, the default was set to 0x3E for all
> platforms. The new value removes ACPI 1.0b compatability, which forces
> the use of XSDT 64-bit pointer, as required by Arm SBBR specification.
> This also resolves an error reported by acpiview command, as seen on
> the RPi (see https://github.com/pftf/RPi4/issues/25).
> 
> Cc: Dandan Bi <dandan.bi@intel.com>
> Cc: Liming Gao <liming.gao@intel.com>
> Cc: Jian J Wang <jian.j.wang@intel.com>
> Cc: Hao A Wu <hao.a.wu@intel.com>
> Cc: Leif Lindholm <leif@nuviainc.com>
> Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
> 
> Signed-off-by: Samer El-Haj-Mahmoud <samer@elhajmahmoud.com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> Reviewed-by: Dandan Bi <dandan.bi@intel.com>
> ---
>  MdeModulePkg/MdeModulePkg.dec | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/MdeModulePkg/MdeModulePkg.dec
> b/MdeModulePkg/MdeModulePkg.dec
> index 497574cb0870..fac16f262cf8 100644
> --- a/MdeModulePkg/MdeModulePkg.dec
> +++ b/MdeModulePkg/MdeModulePkg.dec
> @@ -1548,6 +1548,9 @@
>    # @Prompt Console Output Row of Text Setup
> 
> gEfiMdeModulePkgTokenSpaceGuid.PcdSetupConOutRow|25|UINT32|0x40
> 00000e
> 
> +[PcdsFixedAtBuild.AARCH64, PcdsPatchableInModule.AARCH64]
> +
> gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiExposedTableVersions|0x20|UI
> NT32|0x0001004c
> +


Sorry for the slow response.
Acked-by: Hao A Wu <hao.a.wu@intel.com>

Best Regards,
Hao Wu


>  [PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
>    ## UART clock frequency is for the baud rate configuration.
>    # @Prompt Serial Port Clock Rate.
> --
> 2.17.1