usb probs ehci works vs uhci hangs with Linksys usb200M ( axe0 )

[Bernd Walter]

On Fri, May 14, 2004 at 03:59:27AM +0000, mark wrote:
> 
> 
> 
> I'm looking for a work around to this usb ethernet problem.
> 
> 
> With FreeBSD-5.2.1-p5, "device ehci" added to the default GENERIC kernel,
> the axe device works fine in USB 2.0 mode, when plugged in after boot
> (AFTER ehci driver is loaded)B.
> 
> 
> However, without ehci, uhci tries to attach the device and hangs with
> "read PHY failed". If booted with device plugged, boot stops. If device is
> plugged in after boot, the axe module hangs, looping forever on the read
> error (you can unplug the device but usb never deregisters it) but the
> system remains useable.
> 
> 
> If the system has ehci enabled, and is booted with the device plugged in,
> it hangs when uhci module is loaded because it begins immediate probe
> before ehci is loaded. Thus it is impossible to boot the system in any
> config with the device plugged in at boot.
> 
> 
> Is there any way to disable USB autoprobing, to send a signal or something
> to tell it when to start probing. Alternatively, is there a way to prevent
> USB probing until all USB controllers are loaded (specifically, the ehci
> module)?

You can set the #if 1 to 0 in usb.c to delay probing as a workaround.
Unfortunately this may cause troubles if you have USB devices that are
needed sonner.

-- 
B.Walter                   BWCT                http://www.bwct.de
bernd at bwct.de                                  info at bwct.de