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Annotation of 43BSDTahoe/man/man4/tahoe/enp.4, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1986 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)enp.4       5.1 (Berkeley) 12/12/87
                      6: .\"
                      7: .TH ENP 4 "April 29, 1987"
                      8: .UC 5
                      9: .SH NAME
                     10: enp \- CMC 10 Mb/s Ethernet interface
                     11: .SH SYNOPSIS
                     12: .B "device enp0 at vba? csr 0xfff40000 vector enpintr"
                     13: .SH DESCRIPTION
                     14: The
                     15: .I enp
                     16: interface provides access to a 10 Mb/s Ethernet network through
                     17: a CMC ENP-20 controller.
                     18: .PP
                     19: The hardware has 128 kilobytes of dual-ported memory on the VERSAbus. 
                     20: This memory
                     21: is used for internal buffering by the board, and the interface code reads
                     22: the buffer contents directly through the VERSAbus.
                     23: The address of this memory is derived from the address specified
                     24: in the configuration file.
                     25: .PP
                     26: Each of the host's network addresses
                     27: is specified at boot time with an SIOCSIFADDR
                     28: ioctl.  The
                     29: .I ace
                     30: interface employs the address resolution protocol described in
                     31: .IR arp (4P)
                     32: to dynamically map between Internet and Ethernet addresses on the local
                     33: network.
                     34: .PP
                     35: The interface normally tries to use a ``trailer'' encapsulation
                     36: to minimize copying data on input and output.
                     37: The use of trailers is negotiated with ARP.
                     38: This negotiation may be disabled, on a per-interface basis,
                     39: by setting the IFF_NOTRAILERS
                     40: flag with an SIOCSIFFLAGS ioctl.
                     41: .PP
                     42: Associated with each interface is a character device which
                     43: is used to dowload, start, and reset the firmware in the controller.
                     44: Reading or writing the ``ram device'' reads or writes the writable
                     45: control store in the controller.  Two
                     46: .IR ioctl (2)
                     47: calls, ENPIOGO and ENPIORESET, are used to start and reset the
                     48: firmware.
                     49: .SH DIAGNOSTICS
                     50: .BR "enp%d: can't handle af%d" .
                     51: The interface was handed
                     52: a message with addresses formatted in an unsuitable address
                     53: family; the packet was dropped.
                     54: .SH SEE ALSO
                     55: intro(4N), inet(4F), arp(4P), enpload(8C)
                     56: .SH BUGS
                     57: The hardware is not capable of talking to itself.  The software
                     58: implements local sending and broadcast by sending such packets to the
                     59: loop interface.  This is a kludge.
                     60: .PP
                     61: The link level firmware does not support setting the board's
                     62: Ethernet address.

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