> man ucom says:
> "The portno locator can be used to decide which port to use for devices
> that have multiple external ports."

[...]

> Is the "portno locator" a real existing object or an abstract
> concept? Is it a program, special device or a file?

``portno'' is an optional locator in the kernel configuration file.
i.e. you can declare an ucom attachment as
  ucom* at umct?
but this is really
  ucom* at umct? portno ?

By default, all ucom ports will be attached anyway, but if you want to
force a particular physical port on the device to get a fixed ucom# number
assignment, you can add a configuration line specifying the locator, as in

  ucom0 at umct? portno 1
  ucom* at umct?  # and implicitly ``portno ?''

[The optional locators used to be written in the synopsis lines for the
 relevant manual pages (i.e. you would have seen it in ucom(4)). Maybe
 they should be put back... at least when the manual text makes reference
 to it.]

Miod

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