Open() returns with “No such device” error, but there is such a device (linux)?

If the device shows up in /proc/devices, and you're sure you've got the number right in mknod, then the driver itself is refusing the open. The driver can return any error code from open() - including "no such device", which it might if it discovered a problem initialising the hardware.

I'd guess it is a problem in the driver, check the open function.

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