This is not encouraging:
EHCI(4) FreeBSD Kernel Interfaces Manual EHCI(4)
NAME
ehci -- USB Enhanced Host Controller driver
SYNOPSIS
device ehci
DESCRIPTION
The ehci driver provides support for the USB Enhanced Host Controller
Interface, which is used by USB 2.0 controllers.
EHCI controllers are peculiar in that they can only handle the USB 2.0
protocol. This means that they normally have one or more companion con-
trollers (i.e., ohci(4) or uhci(4)) handling USB 1.x devices. Conse-
quently each USB connector is electrically connected to two USB con-
trollers. The handling of this is totally automatic, but can be noticed
since USB 1.x and USB 2.0 devices plugged in to the same connector appear
to connect to different USB busses.
SEE ALSO
ohci(4), uhci(4), usb(4)
HISTORY
The ehci device driver first appeared in FreeBSD 5.1.
BUGS
The driver is not finished and is quite buggy.
There is currently no support for isochronous transfers.
FreeBSD 5.4 March 20, 2005 FreeBSD 5.4
My test machine has an Intel 82801DB chip which claims to provide USB 2.0
support for all six USB ports. FreeBSD, however, installs the uhci driver
rather than ehci. The ehci/usb module shows to be loaded and the Intel
chip found but aparently not recognized by the ehci driver.
Not clear if this is actually part of the problem with talking to the USRP
but it could be. Clues welcome.
--
LRK
[EMAIL PROTECTED]
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