NAME
hdh —
ACC IF-11/HDH IMP network
interface
SYNOPSIS
pseudo-device imp
hdh0 at uba0 csr 166740 vector hdhintr
DESCRIPTION
NOTE: This driver has not been ported from
4.4BSD yet.
NOTE: At the moment,
NetBSD does not support IMP, so
this manual page is not relevant.
The
hdh 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 interface described in
imp(4). The configuration entry
for the IMP must also include the
pseudo-device as shown
above in the
SYNOPSIS.
DIAGNOSTICS
- hdh%d: not alive.
- The initialization routine was entered even though the
device did not autoconfigure. This indicates 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: TIMEOUT.
- hdh%d: HOST DATA ERROR.
- hdh%d: IMP SEQUENCE ERROR.
- hdh%d: HOST SEQUENCE ERROR.
- These errors indicate that an HDH protocol error has been
detected.
- hdh%d: cannot get supervisor cmnd
buffer.
- This error indicates that an mbuf 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.
SEE ALSO
netintro(4)
HISTORY
The
hdh driver appeared in
4.3BSD.