diff --git a/os/hal/ports/STM32/LLD/RNGv1/hal_trng_lld.c b/os/hal/ports/STM32/LLD/RNGv1/hal_trng_lld.c
index b4a780d90..c81e433f6 100644
--- a/os/hal/ports/STM32/LLD/RNGv1/hal_trng_lld.c
+++ b/os/hal/ports/STM32/LLD/RNGv1/hal_trng_lld.c
@@ -45,7 +45,7 @@ TRNGDriver TRNGD1;
 /* Driver local variables and types.                                         */
 /*===========================================================================*/
 
-static const TRNGConfig default_cfg = {0};
+static const TRNGConfig default_cfg = {.cr = 0};
 
 /*===========================================================================*/
 /* Driver local functions.                                                   */
diff --git a/os/hal/ports/STM32/LLD/RNGv1/hal_trng_lld.h b/os/hal/ports/STM32/LLD/RNGv1/hal_trng_lld.h
index c537b84fd..2a1e9ba46 100644
--- a/os/hal/ports/STM32/LLD/RNGv1/hal_trng_lld.h
+++ b/os/hal/ports/STM32/LLD/RNGv1/hal_trng_lld.h
@@ -85,8 +85,12 @@
 #error "STM32_RNGCLK not defined in this HAL"
 #endif
 
-#if STM32_RNGCLK != 48000000
-#error "STM32_RNGCLK is not exactly 48000000"
+#if ((STM32_RNGCLK < 47000000) || (STM32_RNGCLK > 49000000)) &&             \
+    ((STM32_RNGCLK < 3500000)  || (STM32_RNGCLK > 4500000))
+#if !defined(STM32_DISABLE_RNG_CLOCK_CHECK)
+#error "STM32_RNGCLK is not within a tested clock range"
+#error "define STM32_DISABLE_RNG_CLOCK_CHECK to override this check"
+#endif
 #endif
 
 /*===========================================================================*/
@@ -101,8 +105,8 @@
  * @brief   Low level fields of the TRNG configuration structure.
  */
 #define trng_lld_config_fields                                              \
-  /* Dummy configuration, it is not needed.*/                               \
-  uint32_t                   dummy
+  /* CR register initialization value.*/                                    \
+  uint32_t                   cr
 
 /**
  * @brief   Low level fields of the TRNG driver structure.