[Discuss-gnuradio] FreeBSD - another datapoint

[LRK]

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
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