diff --git a/arch/Kconfig b/arch/Kconfig
index c66100a98c..bacc1ec4bd 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -79,6 +79,7 @@ config ARCH_SIM
 	select ALARM_ARCH
 	select ONESHOT
 	select SERIAL_CONSOLE
+	select SERIAL_IFLOWCONTROL
 	---help---
 		Linux/Cygwin user-mode simulation.
 
diff --git a/arch/sim/src/sim/up_uart.c b/arch/sim/src/sim/up_uart.c
index 5d08cb528c..b26956086c 100644
--- a/arch/sim/src/sim/up_uart.c
+++ b/arch/sim/src/sim/up_uart.c
@@ -81,6 +81,8 @@ static int  tty_ioctl(FAR struct file *filep, int cmd,
 static int  tty_receive(FAR struct uart_dev_s *dev, uint32_t *status);
 static void tty_rxint(FAR struct uart_dev_s *dev, bool enable);
 static bool tty_rxavailable(FAR struct uart_dev_s *dev);
+static bool tty_rxflowcontrol(FAR struct uart_dev_s *dev,
+                              unsigned int nbuffered, bool upper);
 static void tty_send(FAR struct uart_dev_s *dev, int ch);
 static void tty_txint(FAR struct uart_dev_s *dev, bool enable);
 static bool tty_txready(FAR struct uart_dev_s *dev);
@@ -100,6 +102,7 @@ static const struct uart_ops_s g_tty_ops =
   .receive        = tty_receive,
   .rxint          = tty_rxint,
   .rxavailable    = tty_rxavailable,
+  .rxflowcontrol  = tty_rxflowcontrol,
   .send           = tty_send,
   .txint          = tty_txint,
   .txready        = tty_txready,
@@ -415,6 +418,28 @@ static bool tty_rxavailable(struct uart_dev_s *dev)
   return simuart_checkc(dev->isconsole ? 0 : priv->fd);
 }
 
+/****************************************************************************
+ * Name: tty_rxflowcontrol
+ *
+ * Description:
+ *   Return true if UART activated RX flow control to block more incoming
+ *   data.
+ *
+ ****************************************************************************/
+
+static bool tty_rxflowcontrol(FAR struct uart_dev_s *dev,
+                              unsigned int nbuffered, bool upper)
+{
+  FAR struct uart_buffer_s *rxbuf = &dev->recv;
+
+  if (nbuffered == rxbuf->size)
+    {
+      return true;
+    }
+
+  return false;
+}
+
 /****************************************************************************
  * Name: tty_send
  *