On 2015/12/11 9:41, jiewen yao wrote:
Add clarification for PcdAcpiDefaultOemTableId, PcdAcpiDefaultOemRevision,
PcdAcpiDefaultCreatorId, PcdAcpiDefaultCreatorRevision.
According to ACPI spec, they are used as special meaning for SSDT,
so we ignore them in updating generic SSDT provided by EDKII.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen....@intel.com>
Cc: "Zeng, Star" <star.z...@intel.com>com>
---
MdeModulePkg/MdeModulePkg.dec | 14 ++++++++++++++
1 file changed, 14 insertions(+)
Reviewed-by: Star Zeng <star.z...@intel.com>
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 5ec37c5..e2e0b75 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -1408,18 +1408,32 @@
gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultOemId|"INTEL "|VOID*|0x30001034
## Default OEM Table ID for ACPI table creation, it is "EDK2 ".
+ # Accroding to ACPI specification, this field is particularly useful when
+ # defining a definition block to distinguish definition block functions.
+ # The OEM assigns each dissimilar table a new OEM Table ID.
+ # This PCD is ignored for definition block.
# @Prompt Default OEM Table ID for ACPI table creation.
gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultOemTableId|0x20202020324B4445|UINT64|0x30001035
## Default OEM Revision for ACPI table creation.
+ # Accroding to ACPI specification, for LoadTable() opcode, the OS can also
+ # check the OEM Table ID and Revision ID against a database for a newer
+ # revision Definition Block of the same OEM Table ID and load it instead.
+ # This PCD is ignored for definition block.
# @Prompt Default OEM Revision for ACPI table creation.
gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultOemRevision|0x00000002|UINT32|0x30001036
## Default Creator ID for ACPI table creation.
+ # Accroding to ACPI specification, for tables containing Definition Blocks,
+ # this is the ID for the ASL Compiler.
+ # This PCD is ignored for definition block.
# @Prompt Default Creator ID for ACPI table creation.
gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultCreatorId|0x20202020|UINT32|0x30001037
## Default Creator Revision for ACPI table creation.
+ # Accroding to ACPI specification, for tables containing Definition Blocks,
+ # this is the revision for the ASL Compiler.
+ # This PCD is ignored for definition block.
# @Prompt Default Creator Revision for ACPI table creation.
gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultCreatorRevision|0x01000013|UINT32|0x30001038
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