Custom baudrate different than 115200 may be specified only when kwboot is
not going to send boot/debug message pattern or when it is going to send
boot message pattern with image file (in which case baudrate change happens
after sending kwbimage header). BootROM detects boot/debug message pattern
only at baudrate 115200.
Signed-off-by: Pali Rohár <p...@kernel.org>
---
tools/kwboot.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/tools/kwboot.c b/tools/kwboot.c
index 69d1be0f4823..986f27c2012a 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -2133,6 +2133,12 @@ main(int argc, char **argv)
if (optind != argc)
goto usage;
+ /* boot and debug message use baudrate 115200 */
+ if (((bootmsg && !imgpath) || debugmsg) && baudrate != 115200) {
+ fprintf(stderr, "Baudrate other than 115200 cannot be used for
this operation.\n");
+ goto usage;
+ }
+
tty = kwboot_open_tty(ttypath, imgpath ? 115200 : baudrate);
if (tty < 0) {
perror(ttypath);
--
2.20.1
