I insert one printk into drivers/serial/serial_core.c:
uart_set_termios() to describe the issue.
static void uart_set_termios(struct tty_struct *tty, struct termios
*old_termios)
{
----snip----
unsigned int cflag = tty->termios->c_cflag;
BUG_ON(!kernel_locked());
+++printk("new_termios flag: 0x%x, old_termios flag: 0x%x\n");
+++ cflag, old_termios->c_cflag);
----snip ----
}
When I telnet my board and run the following command:
---- root:~> stty -F /dev/ttyS0 -crtscts
I got the following result from the console of my board:
---- root:~>new_termios flag: 0x1cb1, old_termios flag: 0x80001cb1
That's correct. CRTSCTS flag is clear
But when I type "ENTER" key on the console, I got:
----root:~>new_termios flag: 0x80001cb1, old_termios flag: 0x1cb1
The CRTSCTS flag is set back. But I didn't set it back, I just type "ENTER".
I guess, Is it a serial core bug?
-Aubrey
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