bsp/imx: Drain console before reset

Update #3090.

c/src/lib/libbsp/arm/imx/console/console-config.c

@@ -59,6 +59,19 @@ static void imx_uart_write_polled(rtems_termios_device_context *base, char c)
   regs->utxd = IMX_UART_UTXD_TX_DATA(c);
 }
 
+void imx_uart_console_drain(void)
+{
+  volatile imx_uart *regs;
+
+  regs = imx_uart_get_regs(&imx_uart_console->base);
+
+  if (regs != NULL) {
+    while ((regs->usr2 & IMX_UART_USR2_TXFE) == 0) {
+      /* Wait */
+    }
+  }
+}
+
 static void imx_output_char(char c)
 {
   imx_uart_write_polled(&imx_uart_console->base, c);

c/src/lib/libbsp/arm/imx/include/bsp.h

@@ -51,6 +51,8 @@ rtems_vector_number imx_get_irq_of_node(
   size_t index
 );
 
+void imx_uart_console_drain(void);
+
 /**
  * @brief Registers an IMX I2C bus driver.
  *

c/src/lib/libbsp/arm/imx/startup/bspreset.c

@@ -13,13 +13,15 @@
  */
 
 #include <bsp/bootcard.h>
-
+#include <bsp.h>
 #include <arm/freescale/imx/imx_wdogreg.h>
 
 void bsp_reset(void)
 {
   volatile uint16_t *pcr;
 
+  imx_uart_console_drain();
+
   pcr = (volatile uint16_t *) 0x30280000;
   *pcr &= ~WDOG_CR_SRS;
   *pcr &= ~WDOG_CR_SRS;