Hi all,
I've encountered a problem with the driver for the XR17V358
PCIe-to-serial converter. When I try to send data to the chip, it is
only transmitted properly if I am also reading from the tty at the
same point. That is the following sequence in the terminal works:
cat /dev/ttyS13 &
echo "this is a test" > /dev/ttyS13
The data "this is a test" will be sent correctly out the serial port.
However, if I don't cat it and do just the following:
echo "this is a test" > /dev/ttyS13
then I will occasionally get the first character('t'), occasionally
nothing, but never the entire message and never more than one byte.
I tried to track this down earlier today, but I haven't been able to
figure out where exactly it is going wrong. Has anybody else seen
this? Does anybody know what exactly to look for to fix this? I was
poking around alot in 8250_port.c, since that seems to be where most
of this is happening, but I wasn't sure if this is an exar-specific
thing or if it is a problem with all 16550-compatible UARTs.
-Robert Middleton
