Subject: Re: problems with usb2.0 hub?
To: Daniel Carosone <dan@geek.com.au>
From: Steven M. Bellovin <smb@cs.columbia.edu>
List: current-users
Date: 01/05/2005 08:16:16
In message <20050105055827.GW13149@bcd.geek.com.au>, Daniel Carosone writes:
>

>On Tue, Jan 04, 2005 at 11:23:33PM -0500, Steven M. Bellovin wrote:
>> Using a hub -- a 2.0 hub, I think -- connected to a USB 2.0 port,
>> I tried using a 1.1 USB flash disk.  The following messages appeared:
>>=20
>>=20
>> ehci0: *** WARNING: opening low/full speed device, this does not work yet.
>> umass0 at uhub5 port 3 configuration 1 interface 0
>> umass0: M-Systems DiskOnKey, rev 1.00/2.00, addr 3
>> umass0: using SCSI over Bulk-Only
>> ehci0: *** WARNING: opening low/full speed device, this does not work yet.
>> umass0: cannot open 1-out pipe (bulk)
>>=20
>> Is this unsupported?  Here's the messags for the hub itself:
>
>Yes. For now, the only way to use usb1 devices on an ehci is via the
>root-hub ports.  It wasn't that long ago the same was true for usb2
>devices.
>
Got it.  Now, if the system only recognized my USB 2.0 flash disk (but 
that's a different thread)

		--Prof. Steven M. Bellovin, http://www.cs.columbia.edu/~smb