2_dsc_overview/28_pcd_section_processing.md | 56 ++++++++++++++--------------- README.md | 1 + 2 files changed, 29 insertions(+), 28 deletions(-)
https://bugzilla.tianocore.org/show_bug.cgi?id=519
Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Kevin W Shaw <kevin.w.shaw@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
---
2_dsc_overview/28_pcd_section_processing.md | 56 ++++++++++++++---------------
README.md | 1 +
2 files changed, 29 insertions(+), 28 deletions(-)
diff --git a/2_dsc_overview/28_pcd_section_processing.md b/2_dsc_overview/28_pcd_section_processing.md
index 0969b41..1adde81 100644
--- a/2_dsc_overview/28_pcd_section_processing.md
+++ b/2_dsc_overview/28_pcd_section_processing.md
@@ -320,45 +320,45 @@ string plus 1 byte for the null terminator, for L"string" entries to be the
length of the UCS-2 character string plus 2 bytes for the null terminator and
the exact length of a byte array.
-Precedence for determining PCD values (high to low, last in position) is as
-follows:
+The values that are assigned to individual PCDs required by a build may come
+from different locations and different meta-data files. The following provides
+the precedence (high to low) to assign a value to a PCD.
-* A PCD value defined by a MACRO, ("MacroName" in this example), and the Macro
- is defined on the command-line using -D MacroName=Value
+* Command-line, `--pcd` flags (left most has higher priority)
-* A PCD value defined in the FDF file SET statements
+* DSC file, FeatureFlag, PatchableInModule or FixedAtBuild PCD value defined
+ in the `[Components]` INF scoping `<Pcd*>` section statements
-* A PCD value defined positionally in the FDF file
+* FDF file, grammar describing automatic assignment of PCD values
-* A FeatureFlag, PatchableInModule or FixedAtBuild PCD value defined in the
- `[Components]` INF scoping section
+* FDF file, SET statements within a section
-* A FeatureFlag, PatchableInModule or FixedAtBuild PCD value defined in a PCD
- access method section with an architectural modifier (the access method for a
- PCD in a section with an architectural modifier takes precedence over any
- other access method)
+* FDF file, SET statement in the [Defines] section
-In this example, modules built for IA32 architecture, the PCD will use
-PatchableInModule access, while modules built for all other architectures, the
-PCD will use the FixedAtBuild access method:
+* DSC file, a PCD value defined in a PCD access method section with an
+ architectural modifier.
-```ini
-[PcdsFixedAtBuild.common]
- gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeMemorySize|1
- gEfiMdeModulePkgTokenSpaceGuid.PcdResetOnMemoryTypeInformationChange|FALSE
+ In this example, modules built for IA32 architecture, the PCD will use
+ PatchableInModule access, while modules built for all other architectures, the
+ PCD will use the FixedAtBuild access method:
-[PcdsPatchableInModule.IA32]
- gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeMemorySize|1
- gEfiMdeModulePkgTokenSpaceGuid.PcdResetOnMemoryTypeInformationChange|FALSE
-```
+ ```ini
+ [PcdsFixedAtBuild.common]
+ gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeMemorySize|1
+ gEfiMdeModulePkgTokenSpaceGuid.PcdResetOnMemoryTypeInformationChange|FALSE
+
+ [PcdsPatchableInModule.IA32]
+ gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeMemorySize|1
+ gEfiMdeModulePkgTokenSpaceGuid.PcdResetOnMemoryTypeInformationChange|FALSE
+ ```
-* A PCD value defined in a PCD access method (item type) section for common
- architectures
+* DSC file, A PCD value defined in a PCD access method (item type) global
+ `[Pcd*]` section for common architectures.
-* A PCD value defined in an INF (provided all INF files have defined the same
- value)
+* INF file, PCD sections, Default Values (provided all INF files have defined
+ the same value)
-* A PCD default value defined in the DEC file that declares the PCD.
+* DEC file, PCD sections, Default Values
**********
**Note:** Dynamic or DynamicEx PCD sections with architectural modifiers is not
diff --git a/README.md b/README.md
index eb6966f..5e2c17a 100644
--- a/README.md
+++ b/README.md
@@ -181,3 +181,4 @@ Copyright (c) 2006-2017, Intel Corporation. All rights reserved.
| | [#484](https://bugzilla.tianocore.org/show_bug.cgi?id=484) DSC spec: support Prebuild and Postbuild in the [Defines] section | |
| | [#353](https://bugzilla.tianocore.org/show_bug.cgi?id=353) Build spec: Allow nested includes in DSC and FDF files | |
| | [#521](https://bugzilla.tianocore.org/show_bug.cgi?id=521) DSC spec: add clarification for mixed PCD usage in the DSC spec | |
+| | [#519](https://bugzilla.tianocore.org/show_bug.cgi?id=519) DSC Spec: update Precedence of PCD Values | |
--
2.6.3.windows.1
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.01.org
https://lists.01.org/mailman/listinfo/edk2-devel
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>
Best Regards,
Zhu Yonghong
-----Original Message-----
From: Kinney, Michael D
Sent: Wednesday, May 31, 2017 2:00 PM
To: edk2-devel@lists.01.org
Cc: Gao, Liming <liming.gao@intel.com>; Zhu, Yonghong <yonghong.zhu@intel.com>; Shaw, Kevin W <kevin.w.shaw@intel.com>
Subject: [edk2-DscSpecification PATCH v2] Update Precedence of PCD Values
https://bugzilla.tianocore.org/show_bug.cgi?id=519
Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Kevin W Shaw <kevin.w.shaw@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
---
2_dsc_overview/28_pcd_section_processing.md | 56 ++++++++++++++---------------
README.md | 1 +
2 files changed, 29 insertions(+), 28 deletions(-)
diff --git a/2_dsc_overview/28_pcd_section_processing.md b/2_dsc_overview/28_pcd_section_processing.md
index 0969b41..1adde81 100644
--- a/2_dsc_overview/28_pcd_section_processing.md
+++ b/2_dsc_overview/28_pcd_section_processing.md
@@ -320,45 +320,45 @@ string plus 1 byte for the null terminator, for L"string" entries to be the length of the UCS-2 character string plus 2 bytes for the null terminator and the exact length of a byte array.
-Precedence for determining PCD values (high to low, last in position) is as
-follows:
+The values that are assigned to individual PCDs required by a build may
+come from different locations and different meta-data files. The
+following provides the precedence (high to low) to assign a value to a PCD.
-* A PCD value defined by a MACRO, ("MacroName" in this example), and the Macro
- is defined on the command-line using -D MacroName=Value
+* Command-line, `--pcd` flags (left most has higher priority)
-* A PCD value defined in the FDF file SET statements
+* DSC file, FeatureFlag, PatchableInModule or FixedAtBuild PCD value
+defined
+ in the `[Components]` INF scoping `<Pcd*>` section statements
-* A PCD value defined positionally in the FDF file
+* FDF file, grammar describing automatic assignment of PCD values
-* A FeatureFlag, PatchableInModule or FixedAtBuild PCD value defined in the
- `[Components]` INF scoping section
+* FDF file, SET statements within a section
-* A FeatureFlag, PatchableInModule or FixedAtBuild PCD value defined in a PCD
- access method section with an architectural modifier (the access method for a
- PCD in a section with an architectural modifier takes precedence over any
- other access method)
+* FDF file, SET statement in the [Defines] section
-In this example, modules built for IA32 architecture, the PCD will use -PatchableInModule access, while modules built for all other architectures, the -PCD will use the FixedAtBuild access method:
+* DSC file, a PCD value defined in a PCD access method section with an
+ architectural modifier.
-```ini
-[PcdsFixedAtBuild.common]
- gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeMemorySize|1
- gEfiMdeModulePkgTokenSpaceGuid.PcdResetOnMemoryTypeInformationChange|FALSE
+ In this example, modules built for IA32 architecture, the PCD will
+ use PatchableInModule access, while modules built for all other
+ architectures, the PCD will use the FixedAtBuild access method:
-[PcdsPatchableInModule.IA32]
- gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeMemorySize|1
- gEfiMdeModulePkgTokenSpaceGuid.PcdResetOnMemoryTypeInformationChange|FALSE
-```
+ ```ini
+ [PcdsFixedAtBuild.common]
+ gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeMemorySize|1
+
+ gEfiMdeModulePkgTokenSpaceGuid.PcdResetOnMemoryTypeInformationChange|F
+ ALSE
+
+ [PcdsPatchableInModule.IA32]
+ gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeMemorySize|1
+
+ gEfiMdeModulePkgTokenSpaceGuid.PcdResetOnMemoryTypeInformationChange|F
+ ALSE
+ ```
-* A PCD value defined in a PCD access method (item type) section for common
- architectures
+* DSC file, A PCD value defined in a PCD access method (item type)
+global
+ `[Pcd*]` section for common architectures.
-* A PCD value defined in an INF (provided all INF files have defined the same
- value)
+* INF file, PCD sections, Default Values (provided all INF files have
+defined
+ the same value)
-* A PCD default value defined in the DEC file that declares the PCD.
+* DEC file, PCD sections, Default Values
**********
**Note:** Dynamic or DynamicEx PCD sections with architectural modifiers is not diff --git a/README.md b/README.md index eb6966f..5e2c17a 100644
--- a/README.md
+++ b/README.md
@@ -181,3 +181,4 @@ Copyright (c) 2006-2017, Intel Corporation. All rights reserved.
| | [#484](https://bugzilla.tianocore.org/show_bug.cgi?id=484) DSC spec: support Prebuild and Postbuild in the [Defines] section | |
| | [#353](https://bugzilla.tianocore.org/show_bug.cgi?id=353) Build spec: Allow nested includes in DSC and FDF files | |
| | [#521](https://bugzilla.tianocore.org/show_bug.cgi?id=521) DSC spec: add clarification for mixed PCD usage in the DSC spec | |
+| | [#519](https://bugzilla.tianocore.org/show_bug.cgi?id=519) DSC Spec: update Precedence of PCD Values | |
--
2.6.3.windows.1
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