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
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.
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.
So far my most successful approach is the disconnect & reconnect of the
USB cable...
Simon
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