.\" SCCSID: @(#)un.4	8.1	9/11/90.TH un 4 VAX "" Unsupported.SH Nameun \- Ungermann-Bass interface.SH Syntax.B "device un0 at uba0 csr 0160210 vector unintr".SH DescriptionThe.PN uninterface provides access to a 4 Mb/s basebandnetwork.  The hardware uses a standard DEC DR11-WDMA interface in communicating with the host.  TheUngermann-Bass hardware incorporates substantial protocolsoftware in the network device in an attempt to offloadprotocol processing from the host..PPThe network number on which the interface resides mustbe specified at boot time with an SIOCSIFADDR ioctl.The host's address is discovered by communicating withthe interface.  The interface will not transmit or receiveany packets before the network number has been defined..SH RestrictionsThe device does not reset itself properly resulting in theinterface getting hung up in a state from which the onlyrecourse is to reboot the system..SH Diagnostics.BR "un%d: can't initialize" ..brInsufficient UNIBUS resources existed for the device tocomplete initialization.  Usually caused by having multiplenetwork interfaces configured using buffered data paths ona data path poor machine such as the 11/750..PP.BR "un%d: unexpected reset" ..brThe controller indicated a reset when none had been requested.Check the hardware (but see the bugs section below)..PP.BR "un%d: stray interrupt" ..brAn unexpected interrupt was received.  The interrupt wasignored..PP.BR "un%d: input error csr=%b" ..brThe controller indicated an error on moving data from thedevice to host memory..PP.BR "un%d: bad packet type %d" ..brA packet was received with an unknown packet type.  Thepacket is discarded..PP.BR "un%d: output error csr=%b" ..brThe device indicated an error on moving data from the hostto device memory..PP.BR "un%d: invalid state %d csr=%b" ..brThe driver found itself in an invalid internal state.   Thestate is reset to a base state..PP.BR "un%d: can't handle af%d" ..brA request was made to send a message with an address formatwhich the driver does not understand.  The message is discardedand an error is returned to the user..PP.BR "un%d: error limit exceeded" ..brToo many errors were encountered in normal operation.  Thedriver will attempt to reset the device, desist from attemptingany i/o for approximately 60 seconds, then reset itself toa base state in hopes of resyncing itself up with the hardware..PP.BR "un%d: restarting" ..brAfter exceeding its error limit and resettingthe device, the driver is restarting operation..SH See Alsointro(4n), inet(4f)