the console= bootcmd allows for controlling of the initial state of
flow control by adding/omitting the 'r' suffix ... however, the
uart_startup() function in serial_core.c always calls down into the
serial driver with TIOCM_RTS:
static int uart_startup(...) {
...
/*
* Setup the RTS and DTR signals once the
* port is open and ready to respond.
*/
if (info->tty->termios->c_cflag & CBAUD)
uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR);
...
shouldnt TIOCM_RTS be passed down only when the 'r' is appended to the
boot cmdline ? perhaps like this:
uart_set_mctrl(port, (info->flags & UIF_CTS_FLOW ? TIOCM_RTS : 0) | TIOCM_DTR);
assuming too that TIOCM_DTR should always be set ...
-mike
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