In device.hints FreeBSD manpage we have following description:

A device hint line looks like:


where driver is the name of a device driver, unit is the unit number, and keyword is the keyword of the hint. The keyword may be:

I confused about unit term. What unit ?

Is unit refer to number of COM port ?

Why author used this term ?

  • Yes. It is the number of the port, e.g. 0, 1, 2, ... Mar 13 at 8:23
  • @RichardSmith You should make that an answer, not a comment.
    – Rob
    Mar 13 at 9:29


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