diff --git a/libraries/mbed/targets/hal/TARGET_RENESAS/TARGET_RZ_A1H/ethernet_api.c b/libraries/mbed/targets/hal/TARGET_RENESAS/TARGET_RZ_A1H/ethernet_api.c
index 9eee766f1a..30394cbf5f 100644
--- a/libraries/mbed/targets/hal/TARGET_RENESAS/TARGET_RZ_A1H/ethernet_api.c
+++ b/libraries/mbed/targets/hal/TARGET_RENESAS/TARGET_RZ_A1H/ethernet_api.c
@@ -269,7 +269,7 @@ void ethernetext_set_link_mode(int32_t link) {
 int ethernet_init() {
     ethernet_cfg_t ethcfg;
 
-    ethcfg.int_priority = 0;
+    ethcfg.int_priority = 5;
     ethcfg.recv_cb      = NULL;
     ethcfg.ether_mac    = NULL;
     ethernetext_init(&ethcfg);
diff --git a/libraries/rtos/rtx/TARGET_CORTEX_A/RTX_Conf_CA.c b/libraries/rtos/rtx/TARGET_CORTEX_A/RTX_Conf_CA.c
index 37fa755ce6..348ec91da4 100644
--- a/libraries/rtos/rtx/TARGET_CORTEX_A/RTX_Conf_CA.c
+++ b/libraries/rtos/rtx/TARGET_CORTEX_A/RTX_Conf_CA.c
@@ -90,7 +90,7 @@
 //   <1=> Privileged mode
 // <i> Default: Privileged mode
 #ifndef OS_RUNPRIV
- #define OS_RUNPRIV     0
+ #define OS_RUNPRIV     1
 #endif
 
 // </h>
@@ -107,7 +107,11 @@
 //   <i> Defines the timer clock value.
 //   <i> Default: 12000000  (12MHz)
 #ifndef OS_CLOCK
+#  if defined(TARGET_RZ_A1H)
  #define OS_CLOCK       12000000
+#  else
+#    error "no target defined"
+#  endif
 #endif
 
 //   <o>Timer tick value [us] <1-1000000>
@@ -161,7 +165,7 @@
 //   <i> Defines stack size for Timer thread.
 //   <i> Default: 200
 #ifndef OS_TIMERSTKSZ
- #define OS_TIMERSTKSZ  400
+ #define OS_TIMERSTKSZ  WORDS_STACK_SIZE
 #endif
 
 //   <o>Timer Callback Queue size <1-32>
@@ -194,7 +198,7 @@
 //  Define max. number system mutexes that are used to protect 
 //  the arm standard runtime library. For microlib they are not used.
 #ifndef OS_MUTEXCNT
- #define OS_MUTEXCNT    8
+ #define OS_MUTEXCNT    12
 #endif
 
 /*----------------------------------------------------------------------------
@@ -216,10 +220,6 @@ void os_idle_demon (void) {
 
   for (;;) {
     /* HERE: include optional user code to be executed when no thread runs.*/
-#if 0
-      __DSB();
-      __WFI();
-#endif
   }
 }