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intro(4)               FreeBSD Kernel Interfaces Manual               intro(4)

       intro - introduction to special files

       Section 4 describes the special files, related driver functions, and
       networking support available in the system.  In this part of the
       manual, the Syntax heading of each configurable device gives a sample
       specification for use in constructing a system description for the
       program.  The Diagnostics heading lists messages that may appear on the
       console and in the system error log file due to errors in device

       This section contains descriptions of both configurable devices, 4
       entries, and network-related device information, 4n, 4p, and 4f
       entries.  The networking support is introduced in Software support for
       these devices comes in two forms.  A hardware device may be supported
       with a character or block ``device driver'', or it may be used within
       the networking subsystem and have a ``network interface driver''.

       There are some devices that have fixed input/output space CSR addresses
       and interrupt vector addresses. There are no address switches or
       jumpers that need to be set up by the customer or Field Service.

See Also
       intro(4n), MAKEDEV(8)


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