Am 07.08.2007 um 13:50 schrieb Simon Moore:
Dr. H. Nikolaus Schaller wrote:
One more question - how did you manage that dfu-util is not
blocked by the AppleUSBCDC driver which also tries to bind to the
same USB interface?
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It could be a cause of why I have to disconnect & reconnect the USB
cable for each invocation of dfu-util. I have seen this in the
output at times:
Cannot claim interface: usb_claim_interface: couldn't claim interface
Yes, this is the same symptom as I have.
I just checked with kextstat (kextstat | grep CDC), and it does
show the many CDC drivers being loaded when the Neo is connected.
They are not present when the Neo is not connected.
A quick google shows you can manually unload the drivers (not sure
the -b is correct):
sudo kextunload -b com.apple.driver.AppleUSBCDC
sudo kextunload -b com.apple.driver.AppleUSBCDCACMControl
sudo kextunload -b com.apple.driver.AppleUSBCDCECMData
sudo kextunload -b com.apple.driver.AppleUSBCDCACMData
Then the next time the Neo is connected the CDC driver is not loaded.
Not necessarily - there will be a race condition between dfu-util and
the kextloader (trying to reload it).
I just tried this, but it's strange. Unloading AppleUSBCDC worked
ok. Unloading AppleUSBCDCACMControl threw an error that it could
not unload, but thereafter all the CDC drivers were no longer being
loaded. But I still had another 'couldn't claim interface' error.
Maybe the 'couldn't claim interface' error is not resulting from
the Apple drivers? I don't really know enough about USB or libusb,
but the NULL pointer problems (e.g bug #672) make me suspicious.
Yes, there might be other bugs - but I think it is the AppleUSBCDC
which already owns the interface (exclusively). Harald Welte
mentioned that on the owner's and u-boot list.
So far my most successful approach is the disconnect & reconnect of
the USB cable...
I have the additional approach by installing AJZaurusUSB 0.5.2 which
is given a higher driver probe priority to match the device than
AppleUSBCDC. For me it worked, but I have no positive feedback from
others yet.
Nikolaus
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