1.\" Copyright (c) 1983, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)hdh.4 6.4 (Berkeley) 3/27/91 33.\" $Id: hdh.4,v 1.2 1993/08/01 07:36:20 mycroft Exp $ 34.\" 35.Dd March 27, 1991 36.Dt HDH 4 vax 37.Os BSD 4.3 38.Sh NAME 39.Nm hdh 40.Nd 41.Tn ACC 42.Tn IF-11/HDH 43.Tn IMP 44interface 45.Sh SYNOPSIS 46.Cd "pseudo-device imp" 47.Cd "device hdh0 at uba0 csr 166740 vector hdhintr" 48.Sh DESCRIPTION 49The 50.Nm hdh 51device provides an 52.Tn HDLC 53Host 54.Pq Tn HDH 55interface to an 56.Tn IMP . 57It is normally used when participating 58in the 59.Tn DARPA 60Internet. The controller itself is not accessible 61to users, but instead provides the hardware support to the 62.Tn IMP 63interface described in 64.Xr imp 4 . 65The configuration entry for the 66.Tn IMP 67must also include the 68.Em pseudo-device 69as shown above in the 70.Sx SYNOPSIS . 71.Sh DIAGNOSTICS 72.Bl -diag 73.It hdh%d: not alive. 74The initialization routine was entered even though the device 75did not autoconfigure. This indicates a system problem. 76.Pp 77.It hdh%d: cannot get chan %d uba resources. 78Insufficient 79.Tn UNIBUS 80resources existed to initialize the device. 81This is likely to be a shortage of 82.Tn UNIBUS 83mapping registers. 84.Pp 85.It hdh%d: LINE UP. 86This indicates that both the 87.Tn HDLC 88and 89.Tn HDH 90protocols have declared the 91link to the 92.Tn IMP 93alive. 94.Pp 95.It hdh%d: LINE DOWN. 96This indicates that the link to the 97.Tn IMP 98has died. 99.Pp 100.It hdh%d: TIMEOUT. 101.It hdh%d: HOST DATA ERROR. 102.It hdh%d: IMP SEQUENCE ERROR. 103.It hdh%d: HOST SEQUENCE ERROR. 104These errors indicate that an 105.Tn HDH 106protocol error has been detected. 107.Pp 108.It hdh%d: cannot get supervisor cmnd buffer. 109This error indicates that an 110.Em mbuf 111could not be allocated to send a command to the 112.Tn IF-11/HDH . 113.El 114.Pp 115Any other error message from hdh%d: indicates a serious error 116detected by either the driver or the 117.Tn IF-11/HDH 118firmware. 119.Sh SEE ALSO 120.Xr netintro 4 121.Sh HISTORY 122The 123.Nm 124driver appeared in 125.Bx 4.3 . 126