[rtems commit] bsp/xilinx-zynq: Flush TX-Buffer before initializing uart

[Chris Johns]

Module:    rtems
Branch:    master
Commit:    b87efa7599f33f56608da20567d77dbb06db98e1
Changeset: http://git.rtems.org/rtems/commit/?id=b87efa7599f33f56608da20567d77dbb06db98e1

Author:    Jan Sommer <jan.sommer at dlr.de>
Date:      Thu Aug 20 09:18:06 2020 +0200

bsp/xilinx-zynq: Flush TX-Buffer before initializing uart

Closes #4055
Closes #4056

---

 bsps/arm/shared/serial/zynq-uart-polled.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/bsps/arm/shared/serial/zynq-uart-polled.c b/bsps/arm/shared/serial/zynq-uart-polled.c
index 4e0ca46..e6f478e 100644
--- a/bsps/arm/shared/serial/zynq-uart-polled.c
+++ b/bsps/arm/shared/serial/zynq-uart-polled.c
@@ -122,6 +122,8 @@ void zynq_uart_initialize(rtems_termios_device_context *base)
   uint32_t brgr = 0x3e;
   uint32_t bauddiv = 0x6;
 
+  zynq_uart_reset_tx_flush(ctx);
+
   zynq_cal_baud_rate(ZYNQ_UART_DEFAULT_BAUD, &brgr, &bauddiv, regs->mode);
 
   regs->control &= ~(ZYNQ_UART_CONTROL_RXEN | ZYNQ_UART_CONTROL_TXEN);