couldn't get g4 usb clock and pin setup just yet. Leave it as it is for now

hw/bsp/stm32g4/boards/stm32g474nucleo/board.h

@@ -31,6 +31,10 @@
  extern "C" {
 #endif
 
+// G474RE Nucleo does not has usb connection. We need to manually connect
+// - PA11 for D+, CN10.14
+// - PA12 for D-, CN10.12
+
 // LED
 #define LED_PORT              GPIOA
 #define LED_PIN               GPIO_PIN_5
@@ -49,6 +53,7 @@
 #define UART_TX_PIN           GPIO_PIN_2
 #define UART_RX_PIN           GPIO_PIN_3
 
+
 //--------------------------------------------------------------------+
 // RCC Clock
 //--------------------------------------------------------------------+
@@ -81,6 +86,36 @@ static inline void board_clock_init(void)
   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
 
   HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_8);
+
+#if 0 // TODO need to check if USB clock is enabled
+  /* Enable HSI48 */
+  memset(&RCC_OscInitStruct, 0, sizeof(RCC_OscInitStruct));
+
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48;
+  RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
+  HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+  /*Enable CRS Clock*/
+  RCC_CRSInitTypeDef RCC_CRSInitStruct= {0};
+  __HAL_RCC_CRS_CLK_ENABLE();
+
+  /* Default Synchro Signal division factor (not divided) */
+  RCC_CRSInitStruct.Prescaler = RCC_CRS_SYNC_DIV1;
+
+  /* Set the SYNCSRC[1:0] bits according to CRS_Source value */
+  RCC_CRSInitStruct.Source = RCC_CRS_SYNC_SOURCE_USB;
+
+  /* HSI48 is synchronized with USB SOF at 1KHz rate */
+  RCC_CRSInitStruct.ReloadValue =  __HAL_RCC_CRS_RELOADVALUE_CALCULATE(48000000, 1000);
+  RCC_CRSInitStruct.ErrorLimitValue = RCC_CRS_ERRORLIMIT_DEFAULT;
+
+  /* Set the TRIM[5:0] to the default value */
+  RCC_CRSInitStruct.HSI48CalibrationValue = RCC_CRS_HSI48CALIBRATION_DEFAULT;
+
+  /* Start automatic synchronization */
+  HAL_RCCEx_CRSConfig(&RCC_CRSInitStruct);
+#endif
 }
 
 static inline void board_vbus_sense_init(void)