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 | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/kwboot.c b/tools/kwboot.c index 69d1be0f4823..f975c4a6c6ca 100644 --- a/tools/kwboot.c +++ b/tools/kwboot.c @@ -2128,6 +2128,10 @@ main(int argc, char **argv) if (!bootmsg && !term && !debugmsg && !imgpath) goto usage; + /* boot and debug message use baudrate 115200 */ + if (((bootmsg && !imgpath) || debugmsg) && baudrate != 115200) + goto usage; + ttypath = argv[optind++]; if (optind != argc) -- 2.20.1