DoxyGen: Fixed Core(M) version and history.

Change-Id: I556acb6dc6a8fc6157b48491ad1d60f66f709b45
diff --git a/ARM.CMSIS.pdsc b/ARM.CMSIS.pdsc
index 1915e8b..d04a317 100644
--- a/ARM.CMSIS.pdsc
+++ b/ARM.CMSIS.pdsc
@@ -10,7 +10,7 @@
   <releases>
     <release version="5.7.0-dev7">
       Active development...
-      CMSIS-Core(M): 5.5.0
+      CMSIS-Core(M): 5.4.0
         - Fixed device config define checks.  
       Devices:
         - Enable loop and branch info cache for Armv8.1-MML devices.
@@ -32,16 +32,14 @@
         - Added MVE support
     </release>
     <release version="5.7.0-dev3">
-      CMSIS-Core(M): 5.5.0
+      CMSIS-Core(M): 5.4.0
         - L1 Cache functions for Armv7-M and later
       Devices:
         - Include L1 Cache functions in ARMv8MML/ARMv81MML devices
     </release>
     <release version="5.7.0-dev2">
-      CMSIS-Core(M):
+      CMSIS-Core(M): 5.4.0
         - Cortex-M55 cpu support
-        - Cortex-M55 core header file
-        - PMU header file (place holder)
       Devices:
         - ARMCM55 device
     </release>
diff --git a/CMSIS/DoxyGen/Core/core.dxy b/CMSIS/DoxyGen/Core/core.dxy
index 0c7a029..29fc4f9 100644
--- a/CMSIS/DoxyGen/Core/core.dxy
+++ b/CMSIS/DoxyGen/Core/core.dxy
@@ -38,7 +38,7 @@
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = "Version 5.3.0"
+PROJECT_NUMBER         = "Version 5.4.0"
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/CMSIS/DoxyGen/Core/src/Overview.txt b/CMSIS/DoxyGen/Core/src/Overview.txt
index d69056c..b4958cf 100644
--- a/CMSIS/DoxyGen/Core/src/Overview.txt
+++ b/CMSIS/DoxyGen/Core/src/Overview.txt
@@ -81,7 +81,7 @@
  - Arm: Arm Compiler 5.06 update 6 (not for Cortex-M23/33/35P, Armv8-M, Armv8.1-M)
  - Arm: Arm Compiler 6.12
  - Arm: Arm Compiler 6.6.2 (not for Cortex-M0/23/33/35P, Armv8-M, Armv8.1-M)
- - GNU: GNU Tools for Arm Embedded 8.2.1 2018q4
+ - GNU: GNU Tools for Arm Embedded 9.2.1 2019q4
  - IAR: IAR ANSI C/C++ Compiler for Arm 8.20.1.14183
 
 <hr>
@@ -91,18 +91,16 @@
 
 \page core_revisionHistory Revision History of CMSIS-Core (Cortex-M)
 
-\todo complete History for V5.x.x
-
 <table class="cmtable" summary="Revision History">
     <tr>
       <th>Version</th>
       <th>Description</th>
     </tr>
     <tr>
-      <td>V5.x.x</td>
+      <td>V5.4.0</td>
       <td>
 \if ARMv8M
-        Modified: TrustZone setup with \ref partition_h_pg and \ref partition_gen_h_pg.
+        Added: Cortex-M55 support.\n
 \endif
       </td>
     </tr>