On Sun, Jul 13, 2025 at 09:16:17AM +0000, RVP wrote: > Does the link have working HW flow control (RTS/CTS)? If only 3 wires are > active (Rx/Tx/GND), then you'll have to set very low speeds.
The link has hardware flow-control, and it can work at 115200 bps in other contexts. I tired addinc CRTSCTS to control flags, it does not change much struct termios t; memset(&t, 0, sizeof(t)); t.c_ispeed = ucomcons_speed; t.c_ospeed = ucomcons_speed; t.c_cflag = tp->t_cflag ; SET(t.c_cflag, CLOCAL|CRTSCTS); CLR(t.c_cflag, HUPCL); (void)ucomparam(tp, &t); Input received on the other end: "6" "E" "LL" "O" " " "W" "O" "R" "L" "D" "!\r" "\n" "X" "x" -- Emmanuel Dreyfus m...@netbsd.org