1.\" $NetBSD: hdh.4,v 1.7 1999/12/16 00:04:33 abs Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" from: @(#)hdh.4 8.1 (Berkeley) 6/5/93 35.\" 36.Dd June 5, 1993 37.Dt HDH 4 vax 38.Os 39.Sh NAME 40.Nm hdh 41.Nd 42.Tn ACC 43.Tn IF-11/HDH 44.Tn IMP 45network interface 46.Sh SYNOPSIS 47.Cd "pseudo-device imp" 48.Cd "hdh0 at uba0 csr 166740 vector hdhintr" 49.Sh DESCRIPTION 50The 51.Nm hdh 52device provides an 53.Tn HDLC 54Host 55.Pq Tn HDH 56interface to an 57.Tn IMP . 58It is normally used when participating 59in the 60.Tn DARPA 61Internet. The controller itself is not accessible 62to users, but instead provides the hardware support to the 63.Tn IMP 64interface described in 65.Xr imp 4 . 66The configuration entry for the 67.Tn IMP 68must also include the 69.Em pseudo-device 70as shown above in the 71.Sx SYNOPSIS . 72.Sh DIAGNOSTICS 73.Bl -diag 74.It hdh%d: not alive. 75The initialization routine was entered even though the device 76did not autoconfigure. This indicates a system problem. 77.Pp 78.It hdh%d: cannot get chan %d uba resources. 79Insufficient 80.Tn UNIBUS 81resources existed to initialize the device. 82This is likely to be a shortage of 83.Tn UNIBUS 84mapping registers. 85.Pp 86.It hdh%d: LINE UP. 87This indicates that both the 88.Tn HDLC 89and 90.Tn HDH 91protocols have declared the 92link to the 93.Tn IMP 94alive. 95.Pp 96.It hdh%d: LINE DOWN. 97This indicates that the link to the 98.Tn IMP 99has died. 100.Pp 101.It hdh%d: TIMEOUT. 102.It hdh%d: HOST DATA ERROR. 103.It hdh%d: IMP SEQUENCE ERROR. 104.It hdh%d: HOST SEQUENCE ERROR. 105These errors indicate that an 106.Tn HDH 107protocol error has been detected. 108.Pp 109.It hdh%d: cannot get supervisor cmnd buffer. 110This error indicates that an 111.Em mbuf 112could not be allocated to send a command to the 113.Tn IF-11/HDH . 114.El 115.Pp 116Any other error message from hdh%d: indicates a serious error 117detected by either the driver or the 118.Tn IF-11/HDH 119firmware. 120.Sh SEE ALSO 121.Xr netintro 4 122.Sh HISTORY 123The 124.Nm 125driver appeared in 126.Bx 4.3 . 127