NAME
pcl —
DEC CSS PCL-11 B Network
Interface
SYNOPSIS
pcl0 at uba? csr 164200 vector pclxint pclrint
DESCRIPTION
NOTE: This driver has not been ported from
4.4BSD yet.
The
pcl device provides an IP-only interface to the DEC CSS
PCL-11 time division multiplexed network bus. The controller itself is not
accessible to users.
The host's address is specified with the
SIOCSIFADDR
ioctl(2). The interface will
not transmit or receive any data before its address is defined.
As the PCL-11 hardware is only capable of having 15 interfaces per network, a
single-byte host-on-network number is used, with range [1..15] to match the
TDM bus addresses of the interfaces.
The interface currently only supports the Internet protocol family and only
provides “natural” (header) encapsulation.
DIAGNOSTICS
- pcl%d: can't init.
- Insufficient UNIBUS resources existed to initialize the
device. This is likely to occur when the device is run on a buffered data
path on an 11/750 and other network interfaces are also configured to use
buffered data paths, or when it is configured to use buffered data paths
on an 11/730 (which has none).
- pcl%d: can't handle af%d.
- The interface was handed a message with addresses
formatted in an unsuitable address family; the packet was dropped.
- pcl%d: stray xmit interrupt.
- An interrupt occurred when no output had previously been
started.
- pcl%d: master.
- The TDM bus had no station providing ``bus master'' timing
signals, so this interface has assumed the ``master'' role. This message
should only appear at most once per UNIBUS INIT on a single system. Unless
there is a hardware failure, only one station may be master at a
time.
- pcl%d: send error, tcr=%b,
tsr=%b.
- The device indicated a problem sending data on output. If
a ``receiver offline'' error is detected, it is not normally logged unless
the option
PCL_TESTING
has been selected, as this
causes a lot of console chatter when sending to a down machine. However,
this option is quite useful when debugging problems with the PCL
interfaces.
- pcl%d: rcv error, rcr=%b
rsr=%b.
- The device indicated a problem receiving data on
input.
- pcl%d: bad len=%d.
- An input operation resulted in a data transfer of less
than 0 or more than 1008 bytes of data into memory (according to the word
count register). This should never happen as the maximum size of a PCL
message has been agreed upon to be 1008 bytes (same as ARPANET
message).
SEE ALSO
inet(4),
vax/vax/intro(4)
HISTORY
The
pcl interface appeared in
4.2BSD.