USB to serial bug

From: math (mclabon_at_seatech.fau.edu)
Date: 02/26/04

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    To: redhat-list@redhat.com, linux-usb-users@lists.sourceforge.net
Date: Thu, 26 Feb 2004 12:55:03 -0500

      Hello,

    I've been trying to use a Bafo Technologies BF-810 USB to serial on my
    RedHat9 (20.4.20-8) box without success.
    Here's a summary of what I've tried and some strange results I got

    When I plug the device, usbserial and pl2303 are loaded ok. Then I
    connect a Win box with hyperterminal to the new port, and cat
    /dev/usb/ttyUSB0
    First: The fist character is never received.
    There is no new line (or CR, I can never remember) at the end of the
    line on the echo received on the hyperterm (whereas CR/NL are fine with
    the same config on a regular serial port).
    Then, I try to send a text file through the serial link. Everything is
    received ok on the Linux side, but the echo on hyperterm is all messed up.
    Then, when I do a CTRL-C on the Linux console, my computer just freezes,
    with two LEDs on the keyboard blinking. When I do a CTRL-Z instead, and
    then send a TERM signal then a KILL to cat, the process terminates
    nicely. When I just send a KILL, it freezes again.
    I get the exact same result using an application that I wrote to read
    the serial port. Everything goes well until I close( ) the device. At
    that point, the computer freezes again.
    When I reboot Linux, if the hyperterm is still active on the win side, a
    get a kernel panic. If I either stop the hyperterm or disconnect the
    serial link or unplug the USB to serial, Linux boots correctly.

    I've read somewhere that some people getting a kernel panic with
    usbserial and pl2303 say they solved that by upgrading the kernel. So I
    upgraded to 20.4.20-30.9.
    That didn't change anything. In fact, I've read that upgrades to 2.4.23
    or higher solve the bug, but I cannot find anything higher than
    20.4.20-30.9 for RH9.

    Does anybody have a suggestion about what I could try ?
    Otherwise, does anybody know a USB-to-serial that works fine with
    kernels 2.4.20-8 and 2.4.20-30.9 ?
    I guess I could buy a serial to pcmcia, but that's much more expensive -
    and that may not work either.

    Thanks in advance.
    Mathieu 

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