In general, a carriage return needs to execute before a line feed. The patch is to change serial DM driver serial-uclass.c based on this rule.
Signed-off-by: Alison Wang alison.wang@nxp.com --- drivers/serial/serial-uclass.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/serial/serial-uclass.c b/drivers/serial/serial-uclass.c index 1c447ff..f154eb1 100644 --- a/drivers/serial/serial-uclass.c +++ b/drivers/serial/serial-uclass.c @@ -123,11 +123,12 @@ static void _serial_putc(struct udevice *dev, char ch) struct dm_serial_ops *ops = serial_get_ops(dev); int err;
+ if (ch == '\n') + _serial_putc(dev, '\r'); + do { err = ops->putc(dev, ch); } while (err == -EAGAIN); - if (ch == '\n') - _serial_putc(dev, '\r'); }
static void _serial_puts(struct udevice *dev, const char *str)