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To do this, add the following command to the /etc/rc.local file: /sbin/mknod -m 666 /dev/acqrsPCI c 124 0 2.3.3. Environment variables for the Firmware Automatic loading of the firmware needed by 12-bit, analyzer, and averager modules relies on the environment variable AcqirisDxDir pointing to the directory containing the file AqDrv4.ini which in turn points to the directory containing the Firmware .bit files. Therefore, assuming that your Firmware is in /usr/local/AcqirisLinux/Firmware and that