timeouts on USB ISP programmer

Hi all,

my DIAMEX-AVR-USB gets timeouts while talking to the target:
- - -
root@home2l:/ #	avrdude -c stk500v2 -p t85 -P /dev/cuau1 -t -v -i 10

avrdude: Version 6.4
         Copyright (c) Brian Dean, http://www.bdmicro.com/
         Copyright (c) Joerg Wunsch

         System wide configuration file is "/usr/local/etc/avrdude.conf"
         User configuration file is "/root/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : /dev/cuau1
         Using Programmer              : stk500v2
         Setting isp clock delay        :  10
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer
         AVR Part                      : ATtiny85
         Chip Erase delay              : 4500 us
         PAGEL                         : P00
         BS2                           : P00
         RESET disposition             : possible i/o
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65     6     4    0 no        512    4      0  4000  4500 0xff 0xff
           flash         65     6    32    0 yes      8192   64    128  4500  4500 0xff 0xff
           signature      0     0     0    0 no          3    1      0     0     0 0x00 0x00
           lock           0     0     0    0 no          1    1      0  9000  9000 0x00 0x00
           lfuse          0     0     0    0 no          1    1      0  9000  9000 0x00 0x00
           hfuse          0     0     0    0 no          1    1      0  9000  9000 0x00 0x00
           efuse          0     0     0    0 no          1    1      0  9000  9000 0x00 0x00
           calibration    0     0     0    0 no          1    1      0     0     0 0x00 0x00

         Programmer Type : STK500V2
         Description     : Atmel STK500 Version 2.x firmware
         Programmer Model: Unknown
avrdude: stk500v2_ReceiveMessage(): timeout
. . .
avrdude: stk500v2_getsync(): timeout communicating with programmer
avrdude: stk500v2_command(): failed miserably to execute command 0x11
avrdude: stk500v2_disable(): failed to leave programming mode

root@home2l:/ #	usbconfig
ugen0.1: <0x8086 XHCI root HUB> at usbus0, cfg=0 md=HOST spd=SUPER (5.0Gbps) pwr=SAVE (0mA)
ugen0.2: <vendor 0x046a product 0x0023> at usbus0, cfg=0 md=HOST spd=LOW (1.5Mbps) pwr=ON (100mA)
ugen0.3: <Logitech USB Optical Mouse> at usbus0, cfg=0 md=HOST spd=LOW (1.5Mbps) pwr=ON (100mA)
ugen0.4: <ERFOS AVR-ISP2> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON (500mA)
root@home2l:/ #	usbconfig -d ugen0.4 dump_device_desc
ugen0.4: <ERFOS AVR-ISP2> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON (500mA)

  bLength = 0x0012 
  bDescriptorType = 0x0001 
  bcdUSB = 0x0200 
  bDeviceClass = 0x0002  <Communication device>
  bDeviceSubClass = 0x0000 
  bDeviceProtocol = 0x0000 
  bMaxPacketSize0 = 0x0040 
  idVendor = 0x16c0 
  idProduct = 0x2a9b 
  bcdDevice = 0x4340 
  iManufacturer = 0x0001  <ERFOS>
  iProduct = 0x0002  <AVR-ISP2>
  iSerialNumber = 0x0003  <19331-49101-552>
  bNumConfigurations = 0x0001 
- - -

Loading uftdi.ko did not help.

Any help appreciated,
Axel
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