diff --git NuttX/nuttx/drivers/usbdev/cdcacm.c NuttX/nuttx/drivers/usbdev/cdcacm.c
index 64e2e68..15f92dd 100644
--- NuttX/nuttx/drivers/usbdev/cdcacm.c
+++ NuttX/nuttx/drivers/usbdev/cdcacm.c
@@ -243,6 +243,12 @@ static const struct uart_ops_s g_uartops =
 #ifdef CONFIG_SERIAL_IFLOWCONTROL
   cdcuart_rxflowcontrol, /* rxflowcontrol */
 #endif
+#ifdef CONFIG_SERIAL_DMA
+  NULL,                  /* dmasend */
+  NULL,                  /* dmareceive */
+  NULL,                  /* dmarxfree */
+  NULL,                  /* dmatxavail */
+#endif
   NULL,                  /* send */
   cdcuart_txint,         /* txinit */
   NULL,                  /* txready */
diff --git NuttX/nuttx/arch/arm/src/stm32/stm32_serial.c NuttX/nuttx/arch/arm/src/stm32/stm32_serial.c
index 644c810..10919e8 100644
--- NuttX/nuttx/arch/arm/src/stm32/stm32_serial.c
+++ NuttX/nuttx/arch/arm/src/stm32/stm32_serial.c
@@ -1945,11 +1945,11 @@ static int up_interrupt_common(struct up_dev_s *priv)
 static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
 {
 #if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_SERIAL_TIOCSERGSTRUCT) \
-    || defined(CONFIG_STM32F7_SERIALBRK_BSDCOMPAT)
+    || defined(CONFIG_STM32_SERIALBRK_BSDCOMPAT)
   struct inode      *inode = filep->f_inode;
   struct uart_dev_s *dev   = inode->i_private;
 #endif
-#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_STM32F7_SERIALBRK_BSDCOMPAT)
+#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_STM32_SERIALBRK_BSDCOMPAT)
   struct up_dev_s   *priv  = (struct up_dev_s *)dev->priv;
 #endif
   int                ret    = OK;
