Xen devel - Aug 2007 - Problem passing a HP-DAT (USB) device to domU (fwd) (this time with outputs!)

(lspci-output added at the end of this mail!) 

Hi specialists, 

I''m trying to pass an HP Surestore USB-drive to a domU. I''m
hiding the
pci-device in the dom0, and capturing it in the domU. Although this works 
fine I receive the following lines in /var/log/syslog of the dom0 after a 
reboot 

======================================================================Aug  8
00:04:49 localhost kernel: pciback 0000:00:1d.7: Driver tried to
write to a read-only configuration space field at offset 0x54,
size 2. This may be harmless, but if you have problems with your device:
Aug  8 00:04:49 localhost kernel: 1) see permissive attribute in sysfs
Aug  8 00:04:49 localhost kernel: 2) report problems to the xen-devel
mailing list along with details of your device obtained from lspci.
======================================================================= 

and the tapedrive wouldn''t work: udev fails to create devicefiles in
the
domU. 

I''m not quite sure what I''m expected to check in the
/sys-tree: root has
write-permissions all the way down the branches. 

I''m using the stable version of the xen-hypervisor 3.0.3-0-2 (debian). 

As I kind of *need* this functionality I''d be very grateful for any
kind of help or hint. 

Thanx in advance, 

Bests from Vienna/Austria
Matthew A. Wolf 

pS.: THANKS a whole lot for such a fine piece of software! 

ppS.: SORRY! Forgot the output of lspci in the last mail - here is the 
output from lspci in the dom0:
==================================================================00:00.0 Host
bridge: Intel Corporation 5000V Chipset Memory Controller Hub
(rev b1)
00:02.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8 
Port 2-3 (rev b1)
00:03.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 
Port 3 (rev b1)
00:08.0 System peripheral: Intel Corporation 5000 Series Chipset DMA Engine 
(rev b1)
00:10.0 Host bridge: Intel Corporation 5000 Series Chipset Error Reporting 
Registers (rev b1)
00:10.1 Host bridge: Intel Corporation 5000 Series Chipset Error Reporting 
Registers (rev b1)
00:10.2 Host bridge: Intel Corporation 5000 Series Chipset Error Reporting 
Registers (rev b1)
00:11.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved 
Registers (rev b1)
00:13.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved 
Registers (rev b1)
00:15.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers 
(rev b1)
00:16.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers 
(rev b1)
00:1c.0 PCI bridge: Intel Corporation 631xESB/632xESB/3100 Chipset PCI 
Express Root Port 1 (rev 09)
00:1d.0 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI 
USB Controller #1 (rev 09)
00:1d.1 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI 
USB Controller #2 (rev 09)
00:1d.2 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI 
USB Controller #3 (rev 09)
00:1d.3 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI 
USB Controller #4 (rev 09)
00:1d.7 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset EHCI 
USB2 Controller (rev 09)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9)
00:1f.0 ISA bridge: Intel Corporation 631xESB/632xESB/3100 Chipset LPC 
Interface Controller (rev 09)
00:1f.1 IDE interface: Intel Corporation 631xESB/632xESB IDE Controller (rev 
09)
00:1f.2 IDE interface: Intel Corporation 631xESB/632xESB/3100 Chipset SATA 
Storage Controller IDE (rev 09)
00:1f.3 SMBus: Intel Corporation 631xESB/632xESB/3100 Chipset SMBus 
Controller (rev 09)
01:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Upstream 
Port (rev 01)
01:00.3 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express to PCI-X 
Bridge (rev 01)
02:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Downstream 
Port E1 (rev 01)
02:01.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Downstream 
Port E2 (rev 01)
02:02.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Downstream 
Port E3 (rev 01)
05:00.0 Ethernet controller: Intel Corporation 631xESB/632xESB DPT LAN 
Controller Copper (rev 01)
05:00.1 Ethernet controller: Intel Corporation 631xESB/632xESB DPT LAN 
Controller Copper (rev 01)
09:0c.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)
09:0d.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8029(AS)
====================================================================== 

The device in question is 00:1d.7. The output of lspci in the domU is:
=====================================================================00:00.7 USB
Controller: Intel Corporation 631xESB/632xESB/3100 Chipset EHCI
USB2 Controller (rev 09)
====================================================================== 

and the output of lsusb in the domU:
=====================================================================Bus 001
Device 002: ID 03f0:0125 Hewlett-Packard
Bus 001 Device 001: ID 0000:0000
====================================================================== 

What other information can I provide?

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