diff --git a/ARM.CMSIS.pdsc b/ARM.CMSIS.pdsc
index 58b7c04..b87020f 100644
--- a/ARM.CMSIS.pdsc
+++ b/ARM.CMSIS.pdsc
@@ -8,6 +8,11 @@
   <url>http://www.keil.com/pack/</url>
 
   <releases>
+    <release version="5.0.1-dev2">
+      CMSIS-RTOS2:
+       - API 2.1   (see revision history for details)
+       - RTX 5.1.0 (see revision history for details) 
+    </release>
     <release version="5.0.1-dev1">
       All C module and header files: updated removing 'http://' within license header sections flagged by MISRA as comment within comment
       PDSC: added new compatible devices to 'uVision Simulator' generic board description
@@ -451,7 +456,7 @@
         <file category="doc" name="CMSIS/Documentation/RTOS/html/index.html"/>
       </files>
     </api>
-    <api Cclass="CMSIS" Cgroup="RTOS2" Capiversion="2.0" exclusive="1">
+    <api Cclass="CMSIS" Cgroup="RTOS2" Capiversion="2.1" exclusive="1">
       <description>CMSIS-RTOS API for Cortex-M, SC000, and SC300</description>
       <files>
         <file category="doc" name="CMSIS/Documentation/RTOS2/html/index.html"/>
@@ -2202,7 +2207,7 @@
     </component>
 
     <!-- CMSIS-RTOS Keil RTX5 component -->
-    <component Cclass="CMSIS" Cgroup="RTOS" Csub="Keil RTX5" Cversion="5.0.1" Capiversion="1.0" condition="RTOS RTX5">
+    <component Cclass="CMSIS" Cgroup="RTOS" Csub="Keil RTX5" Cversion="5.1.0" Capiversion="1.0" condition="RTOS RTX5">
       <description>CMSIS-RTOS RTX5 implementation for Cortex-M, SC000, and SC300</description>
       <RTE_Components_h>
         <!-- the following content goes into file 'RTE_Components.h' -->
@@ -2218,7 +2223,7 @@
     </component>
 
     <!-- CMSIS-RTOS2 Keil RTX5 component -->
-    <component Cclass="CMSIS" Cgroup="RTOS2" Csub="Keil RTX5" Cvariant="Library" Cversion="5.0.1" Capiversion="2.0" condition="RTOS2 RTX5">
+    <component Cclass="CMSIS" Cgroup="RTOS2" Csub="Keil RTX5" Cvariant="Library" Cversion="5.1.0" Capiversion="2.1" condition="RTOS2 RTX5">
       <description>CMSIS-RTOS2 RTX5 for Cortex-M, SC000, C300 and ARMv8-M (Library)</description>
       <RTE_Components_h>
         <!-- the following content goes into file 'RTE_Components.h' -->
@@ -2234,7 +2239,8 @@
         <file category="header" name="CMSIS/RTOS2/RTX/Include/rtx_os.h"/>
 
         <!-- RTX configuration -->
-        <file category="source" attr="config"   name="CMSIS/RTOS2/RTX/Config/RTX_Config.c" version="5.0.0"/>
+        <file category="header" attr="config"   name="CMSIS/RTOS2/RTX/Config/RTX_Config.h"  version="5.1.0"/>
+        <file category="source" attr="config"   name="CMSIS/RTOS2/RTX/Config/RTX_Config.c"  version="5.1.0"/>
 
         <!-- RTX templates -->
         <file category="source" attr="template" name="CMSIS/RTOS2/RTX/Template/main.c"      version="2.0.0" select="CMSIS-RTOS2 'main' function"/>
@@ -2247,6 +2253,9 @@
         <file category="source" attr="template" name="CMSIS/RTOS2/RTX/Template/Timer.c"     version="2.0.0" select="CMSIS-RTOS2 Timer"/>
         <file category="other"  name="CMSIS/RTOS2/RTX/RTX5.scvd"/>
 
+        <!-- RTX library configuration -->
+        <file category="source" name="CMSIS/RTOS2/RTX/Source/rtx_lib.c"/>
+
         <!-- RTX libraries (CPU and Compiler dependent) -->
         <!-- ARMCC -->
         <file category="library" condition="CM0_LE_ARMCC"         name="CMSIS/RTOS2/RTX/Library/ARM/RTX_CM0.lib"    src="CMSIS/RTOS2/RTX/Source"/>
@@ -2276,7 +2285,7 @@
         <file category="library" condition="ARMv8MML_FP_LE_GCC"   name="CMSIS/RTOS2/RTX/Library/GCC/libRTX_V8MMF.a" src="CMSIS/RTOS2/RTX/Source"/>
       </files>
     </component>
-    <component Cclass="CMSIS" Cgroup="RTOS2" Csub="Keil RTX5" Cvariant="Library_NS" Cversion="5.0.1" Capiversion="2.0" condition="RTOS2 RTX5 NS">
+    <component Cclass="CMSIS" Cgroup="RTOS2" Csub="Keil RTX5" Cvariant="Library_NS" Cversion="5.1.0" Capiversion="2.1" condition="RTOS2 RTX5 NS">
       <description>CMSIS-RTOS2 RTX5 for ARMv8-M Non-Secure Domain (Library)</description>
       <RTE_Components_h>
         <!-- the following content goes into file 'RTE_Components.h' -->
@@ -2293,7 +2302,8 @@
         <file category="header" name="CMSIS/RTOS2/RTX/Include/rtx_os.h"/>
 
         <!-- RTX configuration -->
-        <file category="source" attr="config"   name="CMSIS/RTOS2/RTX/Config/RTX_Config.c" version="5.0.0"/>
+        <file category="header" attr="config"   name="CMSIS/RTOS2/RTX/Config/RTX_Config.h"  version="5.1.0"/>
+        <file category="source" attr="config"   name="CMSIS/RTOS2/RTX/Config/RTX_Config.c"  version="5.1.0"/>
 
         <!-- RTX templates -->
         <file category="source" attr="template" name="CMSIS/RTOS2/RTX/Template/main.c"      version="2.0.0" select="CMSIS-RTOS2 'main' function"/>
@@ -2306,6 +2316,9 @@
         <file category="source" attr="template" name="CMSIS/RTOS2/RTX/Template/Timer.c"     version="2.0.0" select="CMSIS-RTOS2 Timer"/>
         <file category="other"  name="CMSIS/RTOS2/RTX/RTX5.scvd"/>
 
+        <!-- RTX library configuration -->
+        <file category="source" name="CMSIS/RTOS2/RTX/Source/rtx_lib.c"/>
+
         <!-- RTX libraries (CPU and Compiler dependent) -->
         <!-- ARMCC -->
         <file category="library" condition="CM23_LE_ARMCC"        name="CMSIS/RTOS2/RTX/Library/ARM/RTX_V8MBN.lib"   src="CMSIS/RTOS2/RTX/Source"/>
@@ -2323,7 +2336,7 @@
         <file category="library" condition="ARMv8MML_FP_LE_GCC"   name="CMSIS/RTOS2/RTX/Library/GCC/libRTX_V8MMFN.a" src="CMSIS/RTOS2/RTX/Source"/>
       </files>
     </component>
-    <component Cclass="CMSIS" Cgroup="RTOS2" Csub="Keil RTX5" Cvariant="Source" Cversion="5.0.1" Capiversion="2.0" condition="RTOS2 RTX5">
+    <component Cclass="CMSIS" Cgroup="RTOS2" Csub="Keil RTX5" Cvariant="Source" Cversion="5.1.0" Capiversion="2.1" condition="RTOS2 RTX5">
       <description>CMSIS-RTOS2 RTX5 for Cortex-M, SC000, C300 and ARMv8-M (Source)</description>
       <RTE_Components_h>
         <!-- the following content goes into file 'RTE_Components.h' -->
@@ -2340,7 +2353,8 @@
         <file category="header" name="CMSIS/RTOS2/RTX/Include/rtx_os.h"/>
 
         <!-- RTX configuration -->
-        <file category="source" attr="config"   name="CMSIS/RTOS2/RTX/Config/RTX_Config.c" version="5.0.0"/>
+        <file category="header" attr="config"   name="CMSIS/RTOS2/RTX/Config/RTX_Config.h"  version="5.1.0"/>
+        <file category="source" attr="config"   name="CMSIS/RTOS2/RTX/Config/RTX_Config.c"  version="5.1.0"/>
 
         <!-- RTX templates -->
         <file category="source" attr="template" name="CMSIS/RTOS2/RTX/Template/main.c"      version="2.0.0" select="CMSIS-RTOS2 'main' function"/>
@@ -2365,6 +2379,9 @@
         <file category="source" name="CMSIS/RTOS2/RTX/Source/rtx_mempool.c"/>
         <file category="source" name="CMSIS/RTOS2/RTX/Source/rtx_msgqueue.c"/>
         <file category="source" name="CMSIS/RTOS2/RTX/Source/rtx_system.c"/>
+        <file category="source" name="CMSIS/RTOS2/RTX/Source/rtx_evr.c"/>
+        <!-- RTX sources (library configuration) -->
+        <file category="source" name="CMSIS/RTOS2/RTX/Source/rtx_lib.c"/>
         <!-- RTX sources (handlers ARMCC) -->
         <file category="source" name="CMSIS/RTOS2/RTX/Source/ARM/irq_cm0.s"         condition="CM0_ARMCC"/>
         <file category="source" name="CMSIS/RTOS2/RTX/Source/ARM/irq_cm3.s"         condition="CM3_ARMCC"/>
@@ -2393,7 +2410,7 @@
         <file category="source" name="CMSIS/RTOS2/RTX/Source/GCC/irq_armv8mml_fp.S" condition="ARMv8MML_FP_GCC"/>
       </files>
     </component>
-    <component Cclass="CMSIS" Cgroup="RTOS2" Csub="Keil RTX5" Cvariant="Source_NS" Cversion="5.0.1" Capiversion="2.0" condition="RTOS2 RTX5 NS">
+    <component Cclass="CMSIS" Cgroup="RTOS2" Csub="Keil RTX5" Cvariant="Source_NS" Cversion="5.1.0" Capiversion="2.1" condition="RTOS2 RTX5 NS">
       <description>CMSIS-RTOS2 RTX5 for ARMv8-M Non-Secure Domain (Source)</description>
       <RTE_Components_h>
         <!-- the following content goes into file 'RTE_Components.h' -->
@@ -2411,7 +2428,8 @@
         <file category="header" name="CMSIS/RTOS2/RTX/Include/rtx_os.h"/>
 
         <!-- RTX configuration -->
-        <file category="source" attr="config"   name="CMSIS/RTOS2/RTX/Config/RTX_Config.c" version="5.0.0"/>
+        <file category="header" attr="config"   name="CMSIS/RTOS2/RTX/Config/RTX_Config.h"  version="5.1.0"/>
+        <file category="source" attr="config"   name="CMSIS/RTOS2/RTX/Config/RTX_Config.c"  version="5.1.0"/>
 
         <!-- RTX templates -->
         <file category="source" attr="template" name="CMSIS/RTOS2/RTX/Template/main.c"      version="2.0.0" select="CMSIS-RTOS2 'main' function"/>
@@ -2436,6 +2454,9 @@
         <file category="source" name="CMSIS/RTOS2/RTX/Source/rtx_mempool.c"/>
         <file category="source" name="CMSIS/RTOS2/RTX/Source/rtx_msgqueue.c"/>
         <file category="source" name="CMSIS/RTOS2/RTX/Source/rtx_system.c"/>
+        <file category="source" name="CMSIS/RTOS2/RTX/Source/rtx_evr.c"/>
+        <!-- RTX sources (library configuration) -->
+        <file category="source" name="CMSIS/RTOS2/RTX/Source/rtx_lib.c"/>
         <!-- RTX sources (ARMCC handlers) -->
         <file category="source" name="CMSIS/RTOS2/RTX/Source/ARM/irq_armv8mbl_ns.s"    condition="CM23_ARMCC"/>
         <file category="source" name="CMSIS/RTOS2/RTX/Source/ARM/irq_armv8mml_ns.s"    condition="CM33_ARMCC"/>