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Allow to specify the parallel port by its device file. Deprecate port number support but keep it for backward compatibility. This is one necessary step to remove direct I/O support for the parallel port driver. While at it, consistently return ERROR_JTAG_INIT_FAILED in case of a failure in parport_init(). Change-Id: Ie68087f05ece4b32ccab9d9bdfbf7e1a779e9031 Signed-off-by: Marc Schink <dev@zapb.de> Reviewed-on: https://review.openocd.org/c/openocd/+/9152 Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com> Tested-by: jenkins