TEMT is set when the transmitter is totally empty and all output has finished.
This prevents output problems (including a loss of synchronization observed on p2020 that persisted for quite a while) if SPL has output still on its way out.
Signed-off-by: Scott Wood scottwood@freescale.com -- v2: fixed typo in subject, and explained what the bit does in the changelog --- drivers/serial/ns16550.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c index 9027781..bbd91ca 100644 --- a/drivers/serial/ns16550.c +++ b/drivers/serial/ns16550.c @@ -36,6 +36,9 @@
void NS16550_init(NS16550_t com_port, int baud_divisor) { + while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT)) + ; + serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); #if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \ defined(CONFIG_AM33XX)