emptool checks the major device number of the supplied device to determine if it's trying to connect to a USB serial port or a ``real'' serial port. The problem is that the Linux kernel builtin empeg USB driver uses a different major device number than the device number emptool is expecting, requiring the user provide the --usb command line option.

It would be nice if emptool could check against both the expected major number for the supplied kernel module and against the major number used by the kernel builtin driver.