Assigning Device Numbers

The operating system assigns device numbers for cards based on the card type, as well as the order that the cards were placed into the PCI-bus slots. When the first SunVideo Plus card is installed into an open slot, the operating system identifies the card as device /dev/olk0. If a second card is placed in an open slot, it is assigned device number /dev/olk1, and so on.

The operating system remembers the order of slots and SunVideo Plus device numbers, even if a card is removed and later replaced. So if the first SunVideo Plus card is moved to another slot, then the operating system will then identify that card as /dev/olk2. If a new SunVideo Plus card is then placed into the same slot that the first SunVideo Plus card originally occupied, this new card will now be known as /dev/olk0. Once a slot is named as a SunVideo Plus card slot, it retains that same address, regardless of which card actually occupies the slot.