un(4) Unsupported un(4)Nameun - Ungermann-Bass interface
Syntax
device un0 at uba0 csr 0160210 vector unintr
Description
The interface provides access to a 4 Mb/s baseband network. The hard‐
ware uses a standard DEC DR11-W DMA interface in communicating with the
host. The Ungermann-Bass hardware incorporates substantial protocol
software in the network device in an attempt to offload protocol pro‐
cessing from the host.
The network number on which the interface resides must be specified at
boot time with an SIOCSIFADDR ioctl. The host's address is discovered
by communicating with the interface. The interface will not transmit
or receive any packets before the network number has been defined.
Restrictions
The device does not reset itself properly resulting in the interface
getting hung up in a state from which the only recourse is to reboot
the system.
Diagnostics
un%d: can't initialize.
Insufficient UNIBUS resources existed for the device to complete ini‐
tialization. Usually caused by having multiple network interfaces con‐
figured using buffered data paths on a data path poor machine such as
the 11/750.
un%d: unexpected reset.
The controller indicated a reset when none had been requested. Check
the hardware (but see the bugs section below).
un%d: stray interrupt.
An unexpected interrupt was received. The interrupt was ignored.
un%d: input error csr=%b.
The controller indicated an error on moving data from the device to
host memory.
un%d: bad packet type %d.
A packet was received with an unknown packet type. The packet is dis‐
carded.
un%d: output error csr=%b.
The device indicated an error on moving data from the host to device
memory.
un%d: invalid state %d csr=%b.
The driver found itself in an invalid internal state. The state is
reset to a base state.
un%d: can't handle af%d.
A request was made to send a message with an address format which the
driver does not understand. The message is discarded and an error is
returned to the user.
un%d: error limit exceeded.
Too many errors were encountered in normal operation. The driver will
attempt to reset the device, desist from attempting any i/o for approx‐
imately 60 seconds, then reset itself to a base state in hopes of
resyncing itself up with the hardware.
un%d: restarting.
After exceeding its error limit and resetting the device, the driver is
restarting operation.
See Alsointro(4n), inet(4f)
VAX un(4)
