diff --git a/bsp/gd32450z-eval/project.ewp b/bsp/gd32450z-eval/project.ewp
index 5154f827d1..ce741eff7c 100644
--- a/bsp/gd32450z-eval/project.ewp
+++ b/bsp/gd32450z-eval/project.ewp
@@ -198,7 +198,7 @@
                 </option>
                 <option>
                     <name>DSPExtension</name>
-                    <state>1</state>
+                    <state>0</state>
                 </option>
             </data>
         </settings>
@@ -215,6 +215,9 @@
                     <state>GD32F4XX</state>
                     <state>USE_STDPERIPH_DRIVER</state>
                     <state>GD32F4XX</state>
+                    <state>RT_USING_DLIBC</state>
+                    <state>_DLIB_FILE_DESCRIPTOR</state>
+                    <state>_DLIB_THREAD_SUPPORT</state>
                 </option>
                 <option>
                     <name>CCPreprocFile</name>
@@ -342,22 +345,20 @@
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\net\lwip-1.4.1\src</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\libcpu\arm\cortex-m4</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\arch\include</state>
-                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\inc</state>
                     <state>$PROJ_DIR$\Libraries\CMSIS\GD\GD32F4xx\Include</state>
                     <state>$PROJ_DIR$\drivers</state>
                     <state>$PROJ_DIR$\Libraries\GD32F4xx_standard_peripheral\Include</state>
                     <state>$PROJ_DIR$\.</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\finsh</state>
-                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\include</state>
-                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\spi</state>
                     <state>$PROJ_DIR$\Libraries\CMSIS</state>
-                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\trace</state>
+                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\spi</state>
+                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\include</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\include\netif</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\trace\SystemView_Src_V240\SEGGER</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\include\ipv4</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\include</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\include</state>
-                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs</state>
+                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\trace</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\libcpu\arm\common</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\include</state>
                     <state>$PROJ_DIR$\applications</state>
@@ -365,6 +366,7 @@
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\trace\SystemView_Src_V240\Config</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\spi\sfud\inc</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\elmfat</state>
+                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\libc\dlib</state>
                 </option>
                 <option>
                     <name>CCStdIncCheck</name>
@@ -1256,6 +1258,9 @@
                     <state>NDEBUG</state>
                     <state>USE_STDPERIPH_DRIVER</state>
                     <state>GD32F4XX</state>
+                    <state>RT_USING_DLIBC</state>
+                    <state>_DLIB_FILE_DESCRIPTOR</state>
+                    <state>_DLIB_THREAD_SUPPORT</state>
                 </option>
                 <option>
                     <name>CCPreprocFile</name>
@@ -1383,22 +1388,20 @@
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\net\lwip-1.4.1\src</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\libcpu\arm\cortex-m4</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\arch\include</state>
-                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\inc</state>
                     <state>$PROJ_DIR$\Libraries\CMSIS\GD\GD32F4xx\Include</state>
                     <state>$PROJ_DIR$\drivers</state>
                     <state>$PROJ_DIR$\Libraries\GD32F4xx_standard_peripheral\Include</state>
                     <state>$PROJ_DIR$\.</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\finsh</state>
-                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\include</state>
-                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\spi</state>
                     <state>$PROJ_DIR$\Libraries\CMSIS</state>
-                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\trace</state>
+                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\spi</state>
+                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\include</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\include\netif</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\trace\SystemView_Src_V240\SEGGER</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\include\ipv4</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\include</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\include</state>
-                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs</state>
+                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\trace</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\libcpu\arm\common</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\include</state>
                     <state>$PROJ_DIR$\applications</state>
@@ -1406,6 +1409,7 @@
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\trace\SystemView_Src_V240\Config</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\spi\sfud\inc</state>
                     <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\elmfat</state>
+                    <state>$PROJ_DIR$\..\..\..\git\rt-thread\components\libc\dlib</state>
                 </option>
                 <option>
                     <name>CCStdIncCheck</name>
@@ -2152,6 +2156,9 @@
         <file>
             <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\src\ringbuffer.c</name>
         </file>
+        <file>
+            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\rtc\rtc.c</name>
+        </file>
         <file>
             <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\serial\serial.c</name>
         </file>
@@ -2171,6 +2178,36 @@
             <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\drivers\src\workqueue.c</name>
         </file>
     </group>
+    <group>
+        <name>dlib</name>
+        <file>
+            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\libc\dlib\environ.c</name>
+        </file>
+        <file>
+            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\libc\dlib\rmtx.c</name>
+        </file>
+        <file>
+            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\libc\dlib\syscall_close.c</name>
+        </file>
+        <file>
+            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\libc\dlib\syscall_lseek.c</name>
+        </file>
+        <file>
+            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\libc\dlib\syscall_mem.c</name>
+        </file>
+        <file>
+            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\libc\dlib\syscall_open.c</name>
+        </file>
+        <file>
+            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\libc\dlib\syscall_read.c</name>
+        </file>
+        <file>
+            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\libc\dlib\syscall_remove.c</name>
+        </file>
+        <file>
+            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\libc\dlib\syscall_write.c</name>
+        </file>
+    </group>
     <group>
         <name>Drivers</name>
         <file>
@@ -2197,9 +2234,6 @@
     </group>
     <group>
         <name>Filesystem</name>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\elmfat\option\ccsbcs.c</name>
-        </file>
         <file>
             <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\devfs\console.c</name>
         </file>
@@ -2221,75 +2255,9 @@
         <file>
             <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\src\dfs_posix.c</name>
         </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\dfs_uffs.c</name>
-        </file>
         <file>
             <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\elmfat\ff.c</name>
         </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_badblock.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_blockinfo.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_buf.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_crc.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_debug.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_device.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_ecc.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_fd.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_find.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_flash.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_fs.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_init.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_mem.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_mtb.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\uffs_nandif.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_pool.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_public.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\uffs_rtthread.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_tree.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_utils.c</name>
-        </file>
-        <file>
-            <name>$PROJ_DIR$\..\..\..\git\rt-thread\components\dfs\filesystems\uffs\src\uffs\uffs_version.c</name>
-        </file>
     </group>
     <group>
         <name>finsh</name>
diff --git a/bsp/gd32450z-eval/project.uvprojx b/bsp/gd32450z-eval/project.uvprojx
index 83b3daf82d..ad7363eb6f 100644
--- a/bsp/gd32450z-eval/project.uvprojx
+++ b/bsp/gd32450z-eval/project.uvprojx
@@ -1,12 +1,16 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
 <Project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="project_projx.xsd">
+
   <SchemaVersion>2.1</SchemaVersion>
+
   <Header>### uVision Project, (C) Keil Software</Header>
+
   <Targets>
     <Target>
       <TargetName>rt-thread_gd32f4xx</TargetName>
       <ToolsetNumber>0x4</ToolsetNumber>
       <ToolsetName>ARM-ADS</ToolsetName>
+      <pCCUsed>5060422::V5.06 update 4 (build 422)::ARMCC</pCCUsed>
       <TargetOption>
         <TargetCommonOption>
           <Device>GD32F450ZK</Device>
@@ -14,28 +18,28 @@
           <PackID>GigaDevice.GD32F4xx_DFP.1.0.1</PackID>
           <PackURL>http://gd32mcu.21ic.com/data/documents/yingyongruanjian/GD32F4</PackURL>
           <Cpu>IRAM(0x20000000,0x030000) IRAM2(0x10000000,0x010000) IROM(0x08000000,0x0300000) CPUTYPE("Cortex-M4") FPU2 CLOCK(12000000) ELITTLE</Cpu>
-          <FlashUtilSpec />
-          <StartupFile />
+          <FlashUtilSpec></FlashUtilSpec>
+          <StartupFile></StartupFile>
           <FlashDriverDll>UL2CM3(-S0 -C0 -P0 -FD20000000 -FC1000 -FN1 -FF0GD32F4xx_3MB -FS08000000 -FL0300000 -FP0($$Device:GD32F450ZK$Flash\GD32F4xx_3MB.FLM))</FlashDriverDll>
           <DeviceId>0</DeviceId>
           <RegisterFile>$$Device:GD32F450ZK$Device\Include\gd32f4xx.h</RegisterFile>
-          <MemoryEnv />
-          <Cmp />
-          <Asm />
-          <Linker />
-          <OHString />
-          <InfinionOptionDll />
-          <SLE66CMisc />
-          <SLE66AMisc />
-          <SLE66LinkerMisc />
+          <MemoryEnv></MemoryEnv>
+          <Cmp></Cmp>
+          <Asm></Asm>
+          <Linker></Linker>
+          <OHString></OHString>
+          <InfinionOptionDll></InfinionOptionDll>
+          <SLE66CMisc></SLE66CMisc>
+          <SLE66AMisc></SLE66AMisc>
+          <SLE66LinkerMisc></SLE66LinkerMisc>
           <SFDFile>$$Device:GD32F450ZK$SVD\GD32F4xx.svd</SFDFile>
           <bCustSvd>0</bCustSvd>
           <UseEnv>0</UseEnv>
-          <BinPath />
-          <IncludePath />
-          <LibPath />
-          <RegisterFilePath />
-          <DBRegisterFilePath />
+          <BinPath></BinPath>
+          <IncludePath></IncludePath>
+          <LibPath></LibPath>
+          <RegisterFilePath></RegisterFilePath>
+          <DBRegisterFilePath></DBRegisterFilePath>
           <TargetStatus>
             <Error>0</Error>
             <ExitCodeStop>0</ExitCodeStop>
@@ -57,8 +61,8 @@
           <BeforeCompile>
             <RunUserProg1>0</RunUserProg1>
             <RunUserProg2>0</RunUserProg2>
-            <UserProg1Name />
-            <UserProg2Name />
+            <UserProg1Name></UserProg1Name>
+            <UserProg2Name></UserProg2Name>
             <UserProg1Dos16Mode>0</UserProg1Dos16Mode>
             <UserProg2Dos16Mode>0</UserProg2Dos16Mode>
             <nStopU1X>0</nStopU1X>
@@ -67,8 +71,8 @@
           <BeforeMake>
             <RunUserProg1>0</RunUserProg1>
             <RunUserProg2>0</RunUserProg2>
-            <UserProg1Name />
-            <UserProg2Name />
+            <UserProg1Name></UserProg1Name>
+            <UserProg2Name></UserProg2Name>
             <UserProg1Dos16Mode>0</UserProg1Dos16Mode>
             <UserProg2Dos16Mode>0</UserProg2Dos16Mode>
             <nStopB1X>0</nStopB1X>
@@ -78,14 +82,14 @@
             <RunUserProg1>1</RunUserProg1>
             <RunUserProg2>0</RunUserProg2>
             <UserProg1Name>fromelf --bin !L --output rtthread.bin</UserProg1Name>
-            <UserProg2Name />
+            <UserProg2Name></UserProg2Name>
             <UserProg1Dos16Mode>0</UserProg1Dos16Mode>
             <UserProg2Dos16Mode>0</UserProg2Dos16Mode>
             <nStopA1X>0</nStopA1X>
             <nStopA2X>0</nStopA2X>
           </AfterMake>
           <SelectedForBatchBuild>0</SelectedForBatchBuild>
-          <SVCSIdString />
+          <SVCSIdString></SVCSIdString>
         </TargetCommonOption>
         <CommonProperty>
           <UseCPPCompiler>0</UseCPPCompiler>
@@ -99,8 +103,8 @@
           <AssembleAssemblyFile>0</AssembleAssemblyFile>
           <PublicsOnly>0</PublicsOnly>
           <StopOnExitCode>3</StopOnExitCode>
-          <CustomArgument />
-          <IncludeLibraryModules />
+          <CustomArgument></CustomArgument>
+          <IncludeLibraryModules></IncludeLibraryModules>
           <ComprImg>1</ComprImg>
         </CommonProperty>
         <DllOption>
@@ -133,11 +137,11 @@
           </Flash1>
           <bUseTDR>1</bUseTDR>
           <Flash2>BIN\UL2CM3.DLL</Flash2>
-          <Flash3 />
-          <Flash4 />
-          <pFcarmOut />
-          <pFcarmGrp />
-          <pFcArmRoot />
+          <Flash3></Flash3>
+          <Flash4></Flash4>
+          <pFcarmOut></pFcarmOut>
+          <pFcarmGrp></pFcarmGrp>
+          <pFcArmRoot></pFcArmRoot>
           <FcArmLst>0</FcArmLst>
         </Utilities>
         <TargetArmAds>
@@ -170,7 +174,7 @@
             <RvctClst>0</RvctClst>
             <GenPPlst>0</GenPPlst>
             <AdsCpuType>"Cortex-M4"</AdsCpuType>
-            <RvctDeviceName />
+            <RvctDeviceName></RvctDeviceName>
             <mOS>0</mOS>
             <uocRom>0</uocRom>
             <uocRam>0</uocRam>
@@ -302,7 +306,7 @@
                 <Size>0x10000</Size>
               </OCR_RVCT10>
             </OnChipMemories>
-            <RvctStartVector />
+            <RvctStartVector></RvctStartVector>
           </ArmAdsMisc>
           <Cads>
             <interw>1</interw>
@@ -328,9 +332,9 @@
             <v6WtE>0</v6WtE>
             <v6Rtti>0</v6Rtti>
             <VariousControls>
-              <MiscControls />
+              <MiscControls></MiscControls>
               <Define>GD32F4XX, RT_USING_ARM_LIBC, USE_STDPERIPH_DRIVER</Define>
-              <Undefine />
+              <Undefine></Undefine>
               <IncludePath>applications;.;drivers;Libraries\CMSIS\GD\GD32F4xx\Include;Libraries\CMSIS;Libraries\GD32F4xx_standard_peripheral\Include;..\..\..\git\rt-thread\include;..\..\..\git\rt-thread\libcpu\arm\cortex-m4;..\..\..\git\rt-thread\libcpu\arm\common;..\..\..\git\rt-thread\components\dfs\include;..\..\..\git\rt-thread\components\dfs\filesystems\devfs;..\..\..\git\rt-thread\components\dfs\filesystems\elmfat;..\..\..\git\rt-thread\components\drivers\include;..\..\..\git\rt-thread\components\drivers\include;..\..\..\git\rt-thread\components\drivers\include;..\..\..\git\rt-thread\components\drivers\spi;..\..\..\git\rt-thread\components\drivers\include;..\..\..\git\rt-thread\components\drivers\spi\sfud\inc;..\..\..\git\rt-thread\components\drivers\include;..\..\..\git\rt-thread\components\finsh;..\..\..\git\rt-thread\components\libc\armlibc;..\..\..\git\rt-thread\components\net\lwip-1.4.1\src;..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\include;..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\include\ipv4;..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\arch\include;..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\include\netif;..\..\..\git\rt-thread\components\trace;..\..\..\git\rt-thread\components\trace\SystemView_Src_V240\Config;..\..\..\git\rt-thread\components\trace;..\..\..\git\rt-thread\components\trace\SystemView_Src_V240\SEGGER</IncludePath>
             </VariousControls>
           </Cads>
@@ -346,10 +350,10 @@
             <useXO>0</useXO>
             <uClangAs>0</uClangAs>
             <VariousControls>
-              <MiscControls />
-              <Define />
-              <Undefine />
-              <IncludePath />
+              <MiscControls></MiscControls>
+              <Define></Define>
+              <Undefine></Undefine>
+              <IncludePath></IncludePath>
             </VariousControls>
           </Aads>
           <LDads>
@@ -361,13 +365,13 @@
             <useFile>0</useFile>
             <TextAddressRange>0x08000000</TextAddressRange>
             <DataAddressRange>0x20000000</DataAddressRange>
-            <pXoBase />
+            <pXoBase></pXoBase>
             <ScatterFile>.\gd32_rom.ld</ScatterFile>
-            <IncludeLibs />
-            <IncludeLibsPath />
+            <IncludeLibs></IncludeLibs>
+            <IncludeLibsPath></IncludeLibsPath>
             <Misc> --keep *.o(RTMSymTab)  --keep *.o(.rti_fn.*)   --keep *.o(FSymTab) --keep *.o(VSymTab) </Misc>
-            <LinkerInputFile />
-            <DisabledWarnings />
+            <LinkerInputFile></LinkerInputFile>
+            <DisabledWarnings></DisabledWarnings>
           </LDads>
         </TargetArmAds>
       </TargetOption>
@@ -380,43 +384,31 @@
               <FileType>1</FileType>
               <FilePath>applications\application.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>benchmark.c</FileName>
               <FileType>1</FileType>
               <FilePath>applications\benchmark.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>device_test.c</FileName>
               <FileType>1</FileType>
               <FilePath>applications\device_test.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>mem_test.c</FileName>
               <FileType>1</FileType>
               <FilePath>applications\mem_test.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>ping.c</FileName>
               <FileType>1</FileType>
               <FilePath>applications\ping.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>rtgui_demo.c</FileName>
               <FileType>1</FileType>
               <FilePath>applications\rtgui_demo.c</FilePath>
             </File>
-          </Files>
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               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\arch\sys_arch.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>def.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\def.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>dhcp.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\dhcp.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>dns.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\dns.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>init.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\init.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>memp.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\memp.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>netif.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\netif.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>pbuf.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\pbuf.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>raw.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\raw.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>stats.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\stats.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>sys.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\sys.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>tcp.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\tcp.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>tcp_in.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\tcp_in.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>tcp_out.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\tcp_out.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>timers.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\timers.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>udp.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\udp.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>autoip.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\ipv4\autoip.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>icmp.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\ipv4\icmp.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>igmp.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\ipv4\igmp.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>inet.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\ipv4\inet.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>inet_chksum.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\ipv4\inet_chksum.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>ip.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\ipv4\ip.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>ip_addr.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\ipv4\ip_addr.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>ip_frag.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\core\ipv4\ip_frag.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>etharp.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\netif\etharp.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>ethernetif.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\net\lwip-1.4.1\src\netif\ethernetif.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>slipif.c</FileName>
               <FileType>1</FileType>
@@ -1383,22 +1129,16 @@
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\trace\SystemView_Src_V240\Config\SEGGER_SYSVIEW_Config_RTThread.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>SEGGER_SYSVIEW_RTThread.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\trace\SystemView_Src_V240\Config\SEGGER_SYSVIEW_RTThread.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>SEGGER_RTT.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\..\..\git\rt-thread\components\trace\SystemView_Src_V240\SEGGER\SEGGER_RTT.c</FilePath>
             </File>
-          </Files>
-          <Files>
             <File>
               <FileName>SEGGER_SYSVIEW.c</FileName>
               <FileType>1</FileType>
@@ -1406,19 +1146,24 @@
             </File>
           </Files>
         </Group>
+        <Group>
+          <GroupName>::CMSIS</GroupName>
+        </Group>
       </Groups>
     </Target>
   </Targets>
+
   <RTE>
-    <apis />
+    <apis/>
     <components>
       <component Cclass="CMSIS" Cgroup="CORE" Cvendor="ARM" Cversion="5.0.1" condition="ARMv6_7_8-M Device">
-        <package name="CMSIS" schemaVersion="1.3" url="http://www.keil.com/pack/" vendor="ARM" version="5.0.1" />
+        <package name="CMSIS" schemaVersion="1.3" url="http://www.keil.com/pack/" vendor="ARM" version="5.0.1"/>
         <targetInfos>
-          <targetInfo name="rt-thread_gd32f4xx" />
+          <targetInfo name="rt-thread_gd32f4xx"/>
         </targetInfos>
       </component>
     </components>
-    <files />
+    <files/>
   </RTE>
+
 </Project>
diff --git a/bsp/gd32450z-eval/rtconfig.h b/bsp/gd32450z-eval/rtconfig.h
index 1e5b64e205..a75d71fd22 100644
--- a/bsp/gd32450z-eval/rtconfig.h
+++ b/bsp/gd32450z-eval/rtconfig.h
@@ -127,7 +127,7 @@
 
 // <section name="LIBC" description="C Runtime library setting" default="always" >
 // <bool name="RT_USING_LIBC" description="Using libc library" default="true" />
-#define RT_USING_LIBC
+//#define RT_USING_LIBC
 
 /* SECTION: device filesystem */
 /* Using Device file system */