Refine comments for PCD PEIM/driver.

[mirror_edk2.git] / MdeModulePkg / Universal / PCD / Dxe / Pcd.inf

diff --git a/MdeModulePkg/Universal/PCD/Dxe/Pcd.inf b/MdeModulePkg/Universal/PCD/Dxe/Pcd.inf
index 0b0486737eb3a55966c1cb56527008bfea0719bb..5e5bacbcfcdf7bc8c2c0fd0c96683548fb2652e0 100644 (file)
--- a/MdeModulePkg/Universal/PCD/Dxe/Pcd.inf
+++ b/MdeModulePkg/Universal/PCD/Dxe/Pcd.inf
@@ -1,6 +1,17 @@
 #/** @file\r
 # PCD DXE driver manage database contains all dynamic PCD entries initialized in \r
 # PEI phase, DXE phase and produce the implementation of PCD protocol.\r
+#\r
+# There are two PCD Protocols as follows:\r
+#   1) PCD_PROTOCOL \r
+#      It is EDKII implementation which support Dynamic/DynamicEx type Pcds.\r
+#   2) EFI_PCD_PROTOCOL_PPI\r
+#      It is defined by PI specification 1.2, Vol 3 which only support dynamicEx \r
+#      type Pcd.\r
+#\r
+# For dynamicEx type PCD, it is compatible between PCD_PPI and EFI_PEI_PCD_PPI. \r
+# PCD DXE driver will produce above two protocols at same time.\r
+#\r
 # PCD database structure is generated at autogen.h/autogen.c in build time.\r
 #\r
 # ////////////////////////////////////////////////////////////////////////////////\r