diff --git a/Ubiquitous/XiUOS/arch/risc-v/rv32m1_vega/interrupt_gcc.S b/Ubiquitous/XiUOS/arch/risc-v/rv32m1_vega/interrupt_gcc.S
index 0b47c9e29..6e8d2f081 100644
--- a/Ubiquitous/XiUOS/arch/risc-v/rv32m1_vega/interrupt_gcc.S
+++ b/Ubiquitous/XiUOS/arch/risc-v/rv32m1_vega/interrupt_gcc.S
@@ -20,7 +20,7 @@ IRQ_Handler:
     mv  fp, sp
 
     /* switch to interrupt stack */
-    la    sp, __stack
+    # la    sp, __stack
 
     /* interrupt handle */
 
diff --git a/Ubiquitous/XiUOS/arch/risc-v/rv32m1_vega/startup_RV32M1_ri5cy.S b/Ubiquitous/XiUOS/arch/risc-v/rv32m1_vega/startup_RV32M1_ri5cy.S
index 5f153a569..d1e81e712 100644
--- a/Ubiquitous/XiUOS/arch/risc-v/rv32m1_vega/startup_RV32M1_ri5cy.S
+++ b/Ubiquitous/XiUOS/arch/risc-v/rv32m1_vega/startup_RV32M1_ri5cy.S
@@ -23,7 +23,7 @@
 // this License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations under the License.
-
+.extern Rv32m1VgeaStart
 #define EXCEPTION_STACK_SIZE 0x58
 
     .text
@@ -98,7 +98,7 @@ Reset_Handler:
     # Enable global interrupt. */
     # csrsi mstatus, 8
 
-    jal entry
+    jal Rv32m1VgeaStart
     ebreak
 
     .size Reset_Handler, . - Reset_Handler
diff --git a/Ubiquitous/XiUOS/board/rv32m1_vega/board.c b/Ubiquitous/XiUOS/board/rv32m1_vega/board.c
index 6a0c694c1..819e5559e 100644
--- a/Ubiquitous/XiUOS/board/rv32m1_vega/board.c
+++ b/Ubiquitous/XiUOS/board/rv32m1_vega/board.c
@@ -18,6 +18,12 @@
 #include <fsl_intmux.h>
 
 extern int InitHwUart();
+extern void entry(void);
+
+void Rv32m1VgeaStart(void)
+{
+    entry();
+}
 
 void LPIT0_IRQHandler(void)
 {
@@ -55,21 +61,13 @@ void InitBoardHardware(void)
     INTMUX_Init(INTMUX0);
     INTMUX_EnableInterrupt(INTMUX0, 0, PORTC_IRQn);
 
-    /* initialize hardware interrupt */
+    InitHwUart();
     InitHwTick();
+    InstallConsole("uart0", "uart0_drv", "uart0_dev0");
+	KPrintf("console init completed.\n");
 
     InitBoardMemory(MEMORY_START_ADDRESS, MEMORY_END_ADDRESS);
-
-    InitHwUart();
-    InstallConsole("uart0", "uart0_drv", "uart0_dev");
-
-	KPrintf("console init completed.\n");
-    KPrintf("board initialization......\n");
-    
-    // InitHwTick();
     KPrintf("memory address range: [0x%08x - 0x%08x], size: %d\n", (x_ubase) MEMORY_START_ADDRESS, (x_ubase) MEMORY_END_ADDRESS, RV32M1VEGA_SRAM_SIZE);
-    /* initialize memory system */
-	
     KPrintf("board init done.\n");
 	KPrintf("start kernel...\n");
 }
diff --git a/Ubiquitous/XiUOS/board/rv32m1_vega/config.mk b/Ubiquitous/XiUOS/board/rv32m1_vega/config.mk
index f9fcb6cf3..bc88ca594 100755
--- a/Ubiquitous/XiUOS/board/rv32m1_vega/config.mk
+++ b/Ubiquitous/XiUOS/board/rv32m1_vega/config.mk
@@ -1,9 +1,9 @@
 
-export CFLAGS :=  -march=rv32imac -mabi=ilp32 -fno-builtin -fno-exceptions -ffunction-sections  -O2 -Os
+export CFLAGS :=  -march=rv32imac -mabi=ilp32 -fno-builtin -fno-exceptions -ffunction-sections  -O0 -ggdb -Werror
 export AFLAGS :=  -c -march=rv32imac -mabi=ilp32 -x assembler-with-cpp -ggdb
 export LFLAGS :=  -march=rv32imac -mabi=ilp32 -nostartfiles -Wl,--gc-sections,-Map=XiUOS_rv32m1_vega.map,-cref,-u,Reset_Handler -T $(BSP_ROOT)/link.lds
 
-export CXXFLAGS :=  -march=rv32imac -mabi=ilp32 -fno-builtin -fno-exceptions -ffunction-sections  -O2 -Os
+export CXXFLAGS :=  -march=rv32imac -mabi=ilp32 -fno-builtin -fno-exceptions -ffunction-sections  -O0 -ggdb -Werror
 
 export CROSS_COMPILE ?=/opt/gnu-mcu-eclipse/riscv-none-gcc/8.2.0-2.1-20190425-1021/bin/riscv-none-embed-
 
diff --git a/Ubiquitous/XiUOS/board/rv32m1_vega/third_party_driver/uart/connect_uart.c b/Ubiquitous/XiUOS/board/rv32m1_vega/third_party_driver/uart/connect_uart.c
index a2a83852d..e4b47161b 100755
--- a/Ubiquitous/XiUOS/board/rv32m1_vega/third_party_driver/uart/connect_uart.c
+++ b/Ubiquitous/XiUOS/board/rv32m1_vega/third_party_driver/uart/connect_uart.c
@@ -125,8 +125,8 @@ static uint32 SerialInit(struct SerialDriver *serial_drv, struct BusConfigureInf
         break;
     }
 
-    config.enableTx = 0;
-    config.enableRx = 0;
+    config.enableTx = 1;
+    config.enableRx = 1;
 
     CLOCK_SetIpSrc(kCLOCK_Lpuart0, kCLOCK_IpSrcFircAsync);
 
diff --git a/Ubiquitous/XiUOS/kernel/memory/byte_manage.c b/Ubiquitous/XiUOS/kernel/memory/byte_manage.c
index 0df9136da..14cf27fa8 100644
--- a/Ubiquitous/XiUOS/kernel/memory/byte_manage.c
+++ b/Ubiquitous/XiUOS/kernel/memory/byte_manage.c
@@ -1222,8 +1222,9 @@ void ShowBuddy(void)
     	};
 	}
     
-    KPrintf("\n\033[41;1mlist extern memory information\033[0m\n");
+    
 #ifdef MEM_EXTERN_SRAM
+	KPrintf("\n\033[41;1mlist extern memory information\033[0m\n");
 	for(i = 0; i < EXTSRAM_MAX_NUM; i++) {
 		if(NONE != ExtByteManager[i].done){
 			KPrintf("\nlist extern sram[%d] memory information\n\n",i);
diff --git a/Ubiquitous/XiUOS/kernel/thread/tick.c b/Ubiquitous/XiUOS/kernel/thread/tick.c
index 6c2c01439..faf39ef93 100644
--- a/Ubiquitous/XiUOS/kernel/thread/tick.c
+++ b/Ubiquitous/XiUOS/kernel/thread/tick.c
@@ -74,7 +74,9 @@ void TickAndTaskTimesliceUpdate(void)
     RoundRobinTaskTimesliceUpdate(task);
 #elif defined (SCHED_POLICY_RR_REMAINSLICE)
     task = GetKTaskDescriptor();
-    RoundRobinRemainTaskTimesliceUpdate(task);
+    if(task){
+        RoundRobinRemainTaskTimesliceUpdate(task);
+    }
 #endif
     CheckTaskDelay();
 #ifdef KERNEL_SOFTTIMER