add_usb and usb_linux_update_endp_table: Connection timed out

[Marc Weber <marco-oweber@gmx.de>]

> check out for qemu's  "-serial" option
Only some operations do work this way. The atmel controller signature is
read wrongly from the device all the time using this option.
I'd like to try an USB to serial adapter now.

using usb_add host:1.2 or such I am able to attach the harddisk and
WindowsXP even tells me that it could perform better when beeing
attached to an USB 2.0 adapter. But XP itself gets really slow and
does'nt add an addiotianl drive letter.
Adding my serial cable this way I get a line printed on stdout/err:
usb_linux_update_endp_table: Connection timed out
and Could not add USB device `host:7.2`

Is this default behaviour?

$ uname -r
2.6.25.16-default

$ qemu-system-x86_64          
QEMU PC emulator version 0.9.1 (kvm-72), Copyright (c) 2003-2008 Fabrice Bellard

Sincerly Marc