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| author | Sami Mujawar <sami.mujawar@arm.com> | 2018-01-19 14:17:33 +0000 |
|---|---|---|
| committer | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2018-03-07 15:53:40 +0000 |
| commit | 9422cb8c75b3d09346aece73e26720ba96253615 (patch) | |
| tree | 2f4523b240830c4dabec8010bc3cb24af2d81b46 /Silicon | |
| parent | 56df194bb8cd896e5e1c2b15afd14c87645daa38 (diff) | |
| download | edk2-platforms-9422cb8c75b3d09346aece73e26720ba96253615.tar.xz | |
Platform/ARM/VExpressPkg: Provide only 64-bit ACPI entrypoint
According to the SBBR Specification (ARM DEN 0044B), Section 4.2.1.1
"Within the RSDP, the RsdtAddress field must be null (zero)
and the XsdtAddresss MUST be a valid, non-null, 64-bit value."
The PcdAcpiExposedTableVersions is used to indicate the ACPI versions
that are supported. The default value for PcdAcpiExposedTableVersions
is 0x3E which indicates that the ACPI versions 1.0B and above are
supported.
For ACPI 1.0B the RSDT pointer is set in the RSDP table. However for
ACPI versions greater than ACPI 1.0B the AcpiTableDxe populates
the RSDP with the RSDT address set to NULL.
Therefore set the PcdAcpiExposedTableVersions to 0x20 indicating
support for ACPI 5.0 and above.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Evan Lloyd <evan.lloyd@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Diffstat (limited to 'Silicon')
0 files changed, 0 insertions, 0 deletions