diff --git a/os/hal/ports/STM32/LLD/RTCv2/hal_rtc_lld.c b/os/hal/ports/STM32/LLD/RTCv2/hal_rtc_lld.c
index aa8bb5e8b..3c0632ce2 100644
--- a/os/hal/ports/STM32/LLD/RTCv2/hal_rtc_lld.c
+++ b/os/hal/ports/STM32/LLD/RTCv2/hal_rtc_lld.c
@@ -212,10 +212,10 @@ static ps_error_t _read(void *instance, ps_offset_t offset,
   volatile uint32_t *bkpr = &((RTCDriver *)instance)->rtc->BKP0R;
   unsigned i;
 
-  chDbgCheck((instance != NULL) && (rp != NULL));
-  chDbgCheck((n > 0U) && (n <= STM32_RTC_STORAGE_SIZE));
-  chDbgCheck((offset < STM32_RTC_STORAGE_SIZE) &&
-             (offset + n <= STM32_RTC_STORAGE_SIZE));
+  osalDbgCheck((instance != NULL) && (rp != NULL));
+  osalDbgCheck((n > 0U) && (n <= STM32_RTC_STORAGE_SIZE));
+  osalDbgCheck((offset < STM32_RTC_STORAGE_SIZE) &&
+               (offset + n <= STM32_RTC_STORAGE_SIZE));
 
   for (i = 0; i < (unsigned)n; i++) {
     unsigned index = ((unsigned)offset + i) / sizeof (uint32_t);
@@ -231,10 +231,10 @@ static ps_error_t _write(void *instance, ps_offset_t offset,
   volatile uint32_t *bkpr = &((RTCDriver *)instance)->rtc->BKP0R;
   unsigned i;
 
-  chDbgCheck((instance != NULL) && (wp != NULL));
-  chDbgCheck((n > 0U) && (n <= STM32_RTC_STORAGE_SIZE));
-  chDbgCheck((offset < STM32_RTC_STORAGE_SIZE) &&
-             (offset + n <= STM32_RTC_STORAGE_SIZE));
+  osalDbgCheck((instance != NULL) && (wp != NULL));
+  osalDbgCheck((n > 0U) && (n <= STM32_RTC_STORAGE_SIZE));
+  osalDbgCheck((offset < STM32_RTC_STORAGE_SIZE) &&
+               (offset + n <= STM32_RTC_STORAGE_SIZE));
 
   for (i = 0; i < (unsigned)n; i++) {
     unsigned index = ((unsigned)offset + i) / sizeof (uint32_t);
diff --git a/os/hal/ports/STM32/LLD/RTCv3/hal_rtc_lld.c b/os/hal/ports/STM32/LLD/RTCv3/hal_rtc_lld.c
index ecc822951..10768add2 100644
--- a/os/hal/ports/STM32/LLD/RTCv3/hal_rtc_lld.c
+++ b/os/hal/ports/STM32/LLD/RTCv3/hal_rtc_lld.c
@@ -212,10 +212,10 @@ static ps_error_t _read(void *instance, ps_offset_t offset,
   volatile uint32_t *bkpr = &((RTCDriver *)instance)->tamp->BKP0R;
   unsigned i;
 
-  chDbgCheck((instance != NULL) && (rp != NULL));
-  chDbgCheck((n > 0U) && (n <= STM32_RTC_STORAGE_SIZE));
-  chDbgCheck((offset < STM32_RTC_STORAGE_SIZE) &&
-             (offset + n <= STM32_RTC_STORAGE_SIZE));
+  osalDbgCheck((instance != NULL) && (rp != NULL));
+  osalDbgCheck((n > 0U) && (n <= STM32_RTC_STORAGE_SIZE));
+  osalDbgCheck((offset < STM32_RTC_STORAGE_SIZE) &&
+               (offset + n <= STM32_RTC_STORAGE_SIZE));
 
   for (i = 0; i < (unsigned)n; i++) {
     unsigned index = ((unsigned)offset + i) / sizeof (uint32_t);
@@ -231,10 +231,10 @@ static ps_error_t _write(void *instance, ps_offset_t offset,
   volatile uint32_t *bkpr = &((RTCDriver *)instance)->tamp->BKP0R;
   unsigned i;
 
-  chDbgCheck((instance != NULL) && (wp != NULL));
-  chDbgCheck((n > 0U) && (n <= STM32_RTC_STORAGE_SIZE));
-  chDbgCheck((offset < STM32_RTC_STORAGE_SIZE) &&
-             (offset + n <= STM32_RTC_STORAGE_SIZE));
+  osalDbgCheck((instance != NULL) && (wp != NULL));
+  osalDbgCheck((n > 0U) && (n <= STM32_RTC_STORAGE_SIZE));
+  osalDbgCheck((offset < STM32_RTC_STORAGE_SIZE) &&
+               (offset + n <= STM32_RTC_STORAGE_SIZE));
 
   for (i = 0; i < (unsigned)n; i++) {
     unsigned index = ((unsigned)offset + i) / sizeof (uint32_t);
diff --git a/readme.txt b/readme.txt
index 887e3bbac..1ddbff25f 100644
--- a/readme.txt
+++ b/readme.txt
@@ -77,11 +77,14 @@
 - NEW: EFL driver and demo for STM32F3xx.
 - NEW: New unit test subsystem under /os/test. Now it is officially
        ChibiOS/TEST.
+- FIX: Fixed direct calls to RT in STM32 RTCv2 and RTCv3 (bug #1179)
+       (TBP)(backported to 20.3.4).
 - FIX: Fixed STM32G071 mcuconf.h template not showing TIM14/15/16/17
        (bug #1178)(TBP).
 - FIX: Fixed path ambiguity between STM32 USARTv2 and USARTv3 drivers
        (bug #1177)(TBP).
-- FIX: Fixed invalid DMAMUX settings in DMAv1 for some devices (bug #1176)(TBP).
+- FIX: Fixed invalid DMAMUX settings in DMAv1 for some devices (bug #1176)
+       (TBP)(backported to 20.3.4).
 - FIX: Fixed wrong macro in the demo STM32F7xx-SPI-ADXL355 (bug #1175) 
        (backported to 21.6.1).
 - FIX: Fixed problem with RC initialization mask of the GPIO for the