enp man page on 4.4BSD

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ENP(4)		      BSD/tahoe Kernel Interfaces Manual		ENP(4)

NAME
     enp — CMC 10 Mb/s Ethernet interface

SYNOPSIS
     device enp0 at vba? csr 0xfff40000 vector enpintr

DESCRIPTION
     The enp interface provides access to a 10 Mb/s Ethernet network through a
     CMC ENP-20 controller.

     The hardware has 128 kilobytes of dual-ported memory on the VERSAbus.
     This memory is used for internal buffering by the board, and the inter‐
     face code reads the buffer contents directly through the VERSAbus.	 The
     address of this memory is derived from the address specified in the con‐
     figuration file.

     Each of the host's network addresses is specified at boot time with an
     SIOCSIFADDR ioctl(2).  The enp interface employs the address resolution
     protocol described in arp(4) to dynamically map between Internet and Eth‐
     ernet addresses on the local network.

     The interface normally tries to use a “trailer” encapsulation to minimize
     copying data on input and output.	The use of trailers is negotiated with
     ARP.  This negotiation may be disabled, on a per-interface basis, by set‐
     ting the IFF_NOTRAILERS flag with an SIOCSIFFLAGS ioctl.

     Associated with each interface is a character device which is used to
     dowload, start, and reset the firmware in the controller.	Reading or
     writing the “ram device” reads or writes the writable control store in
     the controller.  Two ioctl(2) calls, ENPIOGO and ENPIORESET, are used to
     start and reset the firmware.

DIAGNOSTICS
     enp%d: can't handle af%d.	The interface was handed a message with
     addresses formatted in an unsuitable address family; the packet was
     dropped.

SEE ALSO
     intro(4), inet(4), arp(4), enpload(8)

HISTORY
     The enp driver appeared in 4.3BSD-Tahoe.

BUGS
     The hardware is not capable of talking to itself.	The software imple‐
     ments local sending and broadcast by sending such packets to the loop
     interface.	 This is a kludge.

     The link level firmware does not support setting the board's Ethernet
     address.

4.3-Tahoe Berkeley Distribution	 June 5, 1993  4.3-Tahoe Berkeley Distribution
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