Add a flag indicating when the serial console is ready

For sandbox we have a fallback console which is used very early in
U-Boot, before serial drivers are available. Rather than try to guess
when to switch to the real console, add a flag so we can be sure. This
makes sure that sandbox can always output a panic() message, for example,
and avoids silent failure (which is very annoying in sandbox).

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index 803d8506d9..d2eb7520d0 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -418,6 +418,7 @@ static struct serial_device *get_current(void)
  */
 int serial_init(void)
 {
+	gd->flags |= GD_FLG_SERIAL_READY;
 	return get_current()->start();
 }