You won't have a /proc/driver/nvidia directory unless and until the "nvidia" kernel module gets loaded. Try an /sbin/modprobe nvidiaas root.
In addition, you won't get the video BIOS version numbers in the one file under there unless X is running (and you might even have to be using the nVidia driver, I don't know). The easiest way to get the BIOS version might be to watch for your card's bootup message.
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