1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. 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.\" @(#)hdh.4 8.1 (Berkeley) 6/5/93 33.\" 34.Dd June 5, 1993 35.Dt HDH 4 vax 36.Os BSD 4.3 37.Sh NAME 38.Nm hdh 39.Nd 40.Tn ACC 41.Tn IF-11/HDH 42.Tn IMP 43interface 44.Sh SYNOPSIS 45.Cd "pseudo-device imp" 46.Cd "device hdh0 at uba0 csr 166740 vector hdhintr" 47.Sh DESCRIPTION 48The 49.Nm hdh 50device provides an 51.Tn HDLC 52Host 53.Pq Tn HDH 54interface to an 55.Tn IMP . 56It is normally used when participating 57in the 58.Tn DARPA 59Internet. The controller itself is not accessible 60to users, but instead provides the hardware support to the 61.Tn IMP 62interface described in 63.Xr imp 4 . 64The configuration entry for the 65.Tn IMP 66must also include the 67.Em pseudo-device 68as shown above in the 69.Sx SYNOPSIS . 70.Sh DIAGNOSTICS 71.Bl -diag 72.It hdh%d: not alive. 73The initialization routine was entered even though the device 74did not autoconfigure. This indicates a system problem. 75.Pp 76.It hdh%d: cannot get chan %d uba resources. 77Insufficient 78.Tn UNIBUS 79resources existed to initialize the device. 80This is likely to be a shortage of 81.Tn UNIBUS 82mapping registers. 83.Pp 84.It hdh%d: LINE UP. 85This indicates that both the 86.Tn HDLC 87and 88.Tn HDH 89protocols have declared the 90link to the 91.Tn IMP 92alive. 93.Pp 94.It hdh%d: LINE DOWN. 95This indicates that the link to the 96.Tn IMP 97has died. 98.Pp 99.It hdh%d: TIMEOUT. 100.It hdh%d: HOST DATA ERROR. 101.It hdh%d: IMP SEQUENCE ERROR. 102.It hdh%d: HOST SEQUENCE ERROR. 103These errors indicate that an 104.Tn HDH 105protocol error has been detected. 106.Pp 107.It hdh%d: cannot get supervisor cmnd buffer. 108This error indicates that an 109.Em mbuf 110could not be allocated to send a command to the 111.Tn IF-11/HDH . 112.El 113.Pp 114Any other error message from hdh%d: indicates a serious error 115detected by either the driver or the 116.Tn IF-11/HDH 117firmware. 118.Sh SEE ALSO 119.Xr netintro 4 120.Sh HISTORY 121The 122.Nm 123driver appeared in 124.Bx 4.3 . 125