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| author | klu2 <klu2@6f19259b-4bc3-4df7-8a09-765794883524> | 2009-11-24 03:00:41 +0000 |
|---|---|---|
| committer | klu2 <klu2@6f19259b-4bc3-4df7-8a09-765794883524> | 2009-11-24 03:00:41 +0000 |
| commit | 6c74c5383a77e023030c343fd83d5b625e5b01d1 (patch) | |
| tree | 6b1d9118c4b8a7720c7472a488a4815cfd88e76b /MdeModulePkg/Universal/PCD | |
| parent | 17e7fa8fb1ee16d96a5323146ce6c68cb1d27dc2 (diff) | |
| download | edk2-6c74c5383a77e023030c343fd83d5b625e5b01d1.tar.gz edk2-6c74c5383a77e023030c343fd83d5b625e5b01d1.tar.bz2 edk2-6c74c5383a77e023030c343fd83d5b625e5b01d1.zip | |
Refine comments for PCD PEIM/driver.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9472 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdeModulePkg/Universal/PCD')
| -rw-r--r-- | MdeModulePkg/Universal/PCD/Dxe/Pcd.inf | 11 | ||||
| -rw-r--r-- | MdeModulePkg/Universal/PCD/Pei/Pcd.inf | 8 |
2 files changed, 19 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/PCD/Dxe/Pcd.inf b/MdeModulePkg/Universal/PCD/Dxe/Pcd.inf index 0b0486737e..5e5bacbcfc 100644 --- a/MdeModulePkg/Universal/PCD/Dxe/Pcd.inf +++ b/MdeModulePkg/Universal/PCD/Dxe/Pcd.inf @@ -1,6 +1,17 @@ #/** @file
# PCD DXE driver manage database contains all dynamic PCD entries initialized in
# PEI phase, DXE phase and produce the implementation of PCD protocol.
+#
+# There are two PCD Protocols as follows:
+# 1) PCD_PROTOCOL
+# It is EDKII implementation which support Dynamic/DynamicEx type Pcds.
+# 2) EFI_PCD_PROTOCOL_PPI
+# It is defined by PI specification 1.2, Vol 3 which only support dynamicEx
+# type Pcd.
+#
+# For dynamicEx type PCD, it is compatible between PCD_PPI and EFI_PEI_PCD_PPI.
+# PCD DXE driver will produce above two protocols at same time.
+#
# PCD database structure is generated at autogen.h/autogen.c in build time.
#
# ////////////////////////////////////////////////////////////////////////////////
diff --git a/MdeModulePkg/Universal/PCD/Pei/Pcd.inf b/MdeModulePkg/Universal/PCD/Pei/Pcd.inf index 075e16aeb4..fc39290911 100644 --- a/MdeModulePkg/Universal/PCD/Pei/Pcd.inf +++ b/MdeModulePkg/Universal/PCD/Pei/Pcd.inf @@ -1,6 +1,14 @@ #/** @file
# PCD PEIM produces PCD database to manage all dynamic PCD in PEI phase and install Pcd Ppi service.
#
+# There are two PCD PPIs as follows:
+# 1) PCD_PPI
+# It is EDKII implementation which support Dynamic/DynamicEx Pcds.
+# 2) EFI_PEI_PCD_PPI
+# It is defined by PI specification 1.2, Vol 3 which only support dynamicEx
+# type Pcd.
+# For dynamicEx type PCD, it is compatible between PCD_PPI and EFI_PEI_PCD_PPI.
+#
# ////////////////////////////////////////////////////////////////////////////////
# // //
# // Introduction of PCD database //
|