I'm using embedded Linux platform, kernel is 2.6. I'm using stty command to configure ttyS* high level. The problem is that when I want to turn hardware flow control on:
stty -F /dev/ttySA0 crtscts
it cannot communicate with other device (which also have flow control enabled - this is checked). I have found that in /proc/tty/driver/sc16is7x2 (this is serial device) there is:
serinfo:1.0 driver revision: 0: uart:sc16is752 port:00000001 irq:53 tx:155 rx:0 DSR|CD|RI 1: uart:sc16is752 port:00000002 irq:53 tx:10 rx:0 DSR|CD|RI
while on the other platform with the same hardware (and where hardware flow control works) there is something like:
serinfo:1.0 driver revision: 0: uart:sc16is752 port:00000001 irq:53 tx:155 rx:0 CTS|DSR|CD|RI 1: uart:sc16is752 port:00000002 irq:53 tx:10 rx:0 CTS|DSR|CD|RI
So the difference is in "CTS|DSR|CD|RI" vs "DSR|CD|RI". Could this "DSR|CD|RI" be a problem I cannot use hardware flow control?