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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Thu, 4 Dec 2008 18:53:33 +0100
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Cc: 
Subject: Re: ucom serial bug?
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On Thursday 04 December 2008, Mike Tancsa wrote:
> At 02:33 PM 12/3/2008, Gabor wrote:
> >everything works fine.  When we try to use a USB to serial
> >converter(type doesn't matter, UFTDI or Prolific) we run into
> >problems. The first time we start up our side, everything
> >works.  The second time we don't get carrier(DCD).  The other side
> >is always running. Since we have no control
>
> Also tried with the usb2 development stack, and we never see carrier.
>
> Id Refs Address    Size     Name
>   1   20 0xc0400000 9f8014   kernel (/boot/kernel/kernel)
>   2    1 0xc4b95000 3000     usb2_serial_ftdi.ko
> (/boot/kernel/usb2_serial_ftdi.ko)
>   3    5 0xc4b99000 36000    usb2_core.ko (/boot/kernel/usb2_core.ko)
>   4    1 0xc4c56000 4000     usb2_serial.ko (/boot/kernel/usb2_serial.ko)
>   5    1 0xc4cb4000 a000     usb2_controller_uhci.ko
> (/boot/kernel/usb2_controller_uhci.ko)
>   6    2 0xc4cbe000 3000     usb2_controller.ko
> (/boot/kernel/usb2_controller.ko)
>   7    1 0xc4d50000 d000     usb2_controller_ehci.ko
> (/boot/kernel/usb2_controller_ehci.ko)
>

Hi,

I think this event is not implemented in the driver. Try to diff the NetBSD 
and FreeBSD uftdi.c files.

--HPS