diff --git a/kernel/common/los_config.c b/kernel/common/los_config.c
index a9b78390..f851a7cd 100644
--- a/kernel/common/los_config.c
+++ b/kernel/common/los_config.c
@@ -130,7 +130,6 @@ extern "C" {
 #endif /* __cplusplus */
 
 extern UINT32 OsSystemInit(VOID);
-extern VOID SystemInit(VOID);
 
 VOID __attribute__((weak)) SystemInit(VOID)
 {
diff --git a/shell/full/src/base/show.c b/shell/full/src/base/show.c
index e7eeae7e..13ea0874 100644
--- a/shell/full/src/base/show.c
+++ b/shell/full/src/base/show.c
@@ -100,16 +100,16 @@ STATIC UINT32 OsShellSourceInit(INT32 consoleId)
         ret = LOS_NOK;
         goto ERR_OUT4;
     }
-    if (consoleId == CONSOLE_TELNET
 #if !defined(LOSCFG_PLATFORM_ROOTFS)
-        /*
-	 * In case of ROOTFS disabled but
-	 * serial console enabled, it is required
-	 * to create Shell task in kernel for it.
-	 */
-        || consoleId == CONSOLE_SERIAL
+    /*
+     * In case of ROOTFS disabled but
+     * serial console enabled, it is required
+     * to create Shell task in kernel for it.
+     */
+    if (consoleId == CONSOLE_TELNET || consoleId == CONSOLE_SERIAL) {
+#else
+    if (consoleId == CONSOLE_TELNET) {
 #endif
-                                        ) {
         ret = OsShellCreateTask(shellCB);
         if (ret != LOS_OK) {
             goto ERR_OUT4;
diff --git a/tools/build/mk/los_config.mk b/tools/build/mk/los_config.mk
index 5839d3e5..2fc434d2 100644
--- a/tools/build/mk/los_config.mk
+++ b/tools/build/mk/los_config.mk
@@ -463,10 +463,14 @@ ifeq ($(LOSCFG_COMPILE_DEBUG), y)
     LITEOS_COPTS_OPTION  = -g -gdwarf-2
 else
     ifeq ($(LOSCFG_COMPILER_CLANG_LLVM), y)
-	# WORKAROUND: Disable LTO to avoid undefined __stack_chk_guard
-	#             problem. "externally_visible" attribute could be
-	#             a fix for that but it is not known to our LLVM.
-        LITEOS_COPTS_OPTMIZE = -Oz #-flto
+        ifeq ($(LOSCFG_PLATFORM_QEMU_ARM_VIRT_CA7), y)
+                # WORKAROUND: Disable LTO to avoid undefined __stack_chk_guard
+                #             problem. "externally_visible" attribute could be
+                #             a fix for that but it is not known to our LLVM.
+                LITEOS_COPTS_OPTMIZE = -Oz #-flto
+        else
+                LITEOS_COPTS_OPTMIZE = -Oz -flto
+        endif
     else
         LITEOS_COPTS_OPTMIZE = -O2
     endif