diff --git a/.config b/.config
index fa718fc..3af62a0 100644
--- a/.config
+++ b/.config
@@ -91,7 +91,7 @@ CONFIG_ARCH_ARM_CORTEX_M4=y
 CONFIG_RT_USING_COMPONENTS_INIT=y
 CONFIG_RT_USING_USER_MAIN=y
 CONFIG_RT_MAIN_THREAD_STACK_SIZE=2048
-CONFIG_RT_MAIN_THREAD_PRIORITY=20
+CONFIG_RT_MAIN_THREAD_PRIORITY=5
 
 #
 # C++ features
@@ -502,7 +502,6 @@ CONFIG_ULOG_BACKEND_USING_CONSOLE=y
 # end of PainterEngine: A cross-platform graphics application framework written in C language
 
 # CONFIG_PKG_USING_MCURSES is not set
-# CONFIG_PKG_USING_TERMBOX is not set
 # CONFIG_PKG_USING_VT100 is not set
 # CONFIG_PKG_USING_QRCODE is not set
 # CONFIG_PKG_USING_GUIENGINE is not set
diff --git a/RTK/ST_rtksvr.c b/RTK/ST_rtksvr.c
index 2fbc2ac..88d960f 100644
--- a/RTK/ST_rtksvr.c
+++ b/RTK/ST_rtksvr.c
@@ -738,7 +738,7 @@ int rtksvrinit(rtksvr_t *svr)
             svr->obs[i][j].data = &(svr_obsd[i][j]);
         }
 #else
-    if (!(svr->nav.eph = (eph_t *)malloc(sizeof(eph_t) * MAXSAT * 1)))
+    if (!(svr->nav.eph = (eph_t *)rt_malloc(sizeof(eph_t) * MAXSAT * 1)))
     {
         tracet(1, "rtksvrinit: malloc error\n");
         return 0;
@@ -748,7 +748,7 @@ int rtksvrinit(rtksvr_t *svr)
     svr->nav.n = MAXSAT * 1;
 #ifdef ENAGLO
     geph_t geph0 = {0, -1};
-    if (!(svr->nav.geph = (geph_t *)malloc(sizeof(geph_t) * NSATGLO * 1)))
+    if (!(svr->nav.geph = (geph_t *)rt_malloc(sizeof(geph_t) * NSATGLO * 1)))
     {
         tracet(1, "rtksvrinit: malloc error\n");
         return 0;
@@ -759,7 +759,7 @@ int rtksvrinit(rtksvr_t *svr)
 #endif
 #ifdef ENASBS
     seph_t seph0 = {0};
-    if (!(svr->nav.seph = (seph_t *)malloc(sizeof(seph_t) * NSATSBS * 1)))
+    if (!(svr->nav.seph = (seph_t *)rt_malloc(sizeof(seph_t) * NSATSBS * 1)))
     {
         tracet(1, "rtksvrinit: malloc error\n");
         return 0;
@@ -772,7 +772,7 @@ int rtksvrinit(rtksvr_t *svr)
     for (i = 0; i < 2; i++)
         for (j = 0; j < MAXOBSBUF; j++)
         {
-            if (!(svr->obs[i][j].data = (obsd_t *)malloc(sizeof(obsd_t) * MAXOBS)))
+            if (!(svr->obs[i][j].data = (obsd_t *)rt_malloc(sizeof(obsd_t) * MAXOBS)))
             {
                 tracet(1, "rtksvrinit: malloc error\n");
                 return 0;
diff --git a/rtconfig.h b/rtconfig.h
index 6b9d74a..343f9b9 100644
--- a/rtconfig.h
+++ b/rtconfig.h
@@ -59,7 +59,7 @@
 #define RT_USING_COMPONENTS_INIT
 #define RT_USING_USER_MAIN
 #define RT_MAIN_THREAD_STACK_SIZE 2048
-#define RT_MAIN_THREAD_PRIORITY 20
+#define RT_MAIN_THREAD_PRIORITY 5
 
 /* C++ features */
 
@@ -261,10 +261,6 @@
 
 /* end of enhanced kernel services */
 
-/* POSIX extension functions */
-
-/* end of POSIX extension functions */
-
 /* acceleration: Assembly language or algorithmic acceleration packages */
 
 /* end of acceleration: Assembly language or algorithmic acceleration packages */