usb/140810: 8.X+ uftdi copy and paste problem / tty overflow

[Hans Petter Selasky]

On Monday 23 November 2009 16:45:54 Corey Smith wrote:
> >Number:         140810
> >Category:       usb
> >Synopsis:       8.X+ uftdi copy and paste problem / tty overflow
> >Confidential:   no
> >Severity:       serious
> >Priority:       medium
> >Responsible:    freebsd-usb
> >State:          open
> >Quarter:
> >Keywords:
> >Date-Required:
> >Class:          sw-bug
> >Submitter-Id:   current-users
> >Arrival-Date:   Mon Nov 23 15:50:01 UTC 2009
> >Closed-Date:
> >Last-Modified:
> >Originator:     Corey Smith
> >Release:        8.0-RC3
> >Organization:
>
> BondDesk Group
>
> >Environment:
>
> FreeBSD  8.0-RC3 FreeBSD 8.0-RC3 #2: Fri Nov 20 18:28:57 EST 2009    
> root@:/usr/src/sys/amd64/compile/GENERIC  amd64
>
> >Description:
>
> We are using a VSCOM USB-16COM-RM which is a UFTDI based 16 port serial
> terminal.
>
> It is detected as 8 FT2232C dual port serial connections:
>
> product FTDI SERIAL_2232C       0x6010  FT2232C Dual port Serial
>
> ugen3.3: <USB FAST SERIAL ADAPTER FTDI> at usbus3, cfg=0 md=HOST spd=FULL
> (12Mbps) pwr=ON
>
>   bLength = 0x0012
>   bDescriptorType = 0x0001
>   bcdUSB = 0x0200
>   bDeviceClass = 0x0000
>   bDeviceSubClass = 0x0000
>   bDeviceProtocol = 0x0000
>   bMaxPacketSize0 = 0x0008
>   idVendor = 0x0403
>   idProduct = 0x6010
>   bcdDevice = 0x0500
>   iManufacturer = 0x0001  <FTDI>
>   iProduct = 0x0002  <USB FAST SERIAL ADAPTER>
>   iSerialNumber = 0x0003  <FT58L91Z>
>   bNumConfigurations = 0x0001
>
> If you 'tip ucom1' and paste a long sequence of text into the terminal then
> the terminal will start to constantly spew what appears to be random memory
> contents to the host connected on ucom1.  This same configuration is known
> good in 7.1-RELEASE.
>
> The problem definitely occurs on 8.0-BETA3 and 8.0-RC3.  The serial ports
> work fine if you never copy and paste but as soon as you start to copy and
> paste more than 60 odd characters at a time you see this random garbage on
> the tty.  AFAIK the garbage will continuously send to the attached host
> until you reboot the box.
>
> I don't know if this problem is reproducible using other uftdi based
> devices as I don't have any other hardware to test with.
>
> >How-To-Repeat:
>
> Paste long sequences of text into a tip session connected through a uftdi
> device under 8.0-RC3.  Notice constant garbage being transmitted to the
> host until you reboot the console server.
>
> >Fix:
>
> No fix but a workaround is to not copy and paste into terminals connected
> through uftdi devices.
>

Hi,

I can you enable ucom debugging while doing the test?

sysctl hw.usb.ucom.debug=15

--HPS