4.3BSD-UWisc/man/cat4/hdh.4

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HDH(4)              UNIX Programmer's Manual               HDH(4)



NAME
     hdh - ACC IF-11/HDH IMP interface

SYNOPSIS
     pseudo-device imp
     device hdh0 at uba0 csr 166740 vector hdhintr

DESCRIPTION
     The _h_d_h device provides an HDLC Host (HDH) interface to an
     IMP.  It is normally used when participating in the DARPA
     Internet.  The controller itself is not accessible to users,
     but instead provides the hardware support to the IMP inter-
     face described in _i_m_p(4).  When configuring, the _i_m_p
     pseudo-device must also be included.

DIAGNOSTICS
     hdh%d: not alive.  The initialization routine was entered
     even though the device did not autoconfigure.  This indi-
     cates a system problem.

     hdh%d: cannot get chan %d uba resources.  Insufficient
     UNIBUS resources existed to initialize the device.  This is
     likely to be a shortage of UNIBUS mapping registers.

     hdh%d: LINE UP.  This indicates that both the HDLC and HDH
     protocols have declared the link to the IMP alive.

     hdh%d: LINE DOWN.  This indicates that the link to the IMP
     has died.

     hdh%d: HOST SEQUENCE ERROR
     hdh%d: IMP SEQUENCE ERROR
     hdh%d: HOST DATA ERROR
     hdh%d: TIMEOUT
     These errors indicate that an HDH protocol error has been
     detected.

     hdh%d: cannot get supervisor cmnd buffer.  This error indi-
     cates that an _m_b_u_f could not be allocated to send a command
     to the IF-11/HDH.

     Any other error message from hdh%d: indicates a serious
     error detected by either the driver or the IF-11/HDH
     firmware.











Printed 12/27/86         August 8, 1985                         1