Lennart,

> Some devices are just plain buggy when it comes to the CSW handling.
> You could try disabling that check in umass by setting the appropriate
> quirk for the device.

It does not work. The error message is gone, but the device hangs 
nevertheless. I am a bit puzzled, because when I wrote the device with 
my office computer, which run NetBSD 2.0RC4 but has only a USB 1.1 
interface, it worked fine. That's why I thought immediately about some 
bug in the EHCI code…

Vincent