Copyright (c) 1996, Fred Gray
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This product includes software developed by David Greenman.
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$Id: vx.4,v 1.5 1997/03/12 13:37:56 joerg Exp $

.Dd January 15, 1996 .Dt VX 4 i386 .Os .Sh NAME .Nm vx .Nd PCI Ethernet device driver .Sh SYNOPSIS .Cd "device vx0" .Sh DESCRIPTION The .Nm vx driver provides support for the 3Com 3c590 and 3c595 EtherLink III and Fast EtherLink III PCI Ethernet cards in 10 Mbps mode. The medium selection can be influenced by the following link flags to the .Xr ifconfig 8 command:

p l -tag -width LINK0X -compact t Em link0 Use the AUI port. t Em link1 Use the BNC port. t Em link2 Use the UTP port. .El .Sh DIAGNOSTICS l -diag t "vx%d: not configured; kernel is built for only %d devices." There are not enough devices in the kernel configuration file for the number of adapters present in the system. Add devices to the configuration file, rebuild the kernel, and reboot.

p All other diagnostics indicate either a hardware problem or a bug in the driver. .Sh CAVEATS Some early-revision 3c590 cards are defective and suffer from many receive overruns, which cause lost packets. The author has attempted to implement a test for it based on the information supplied by 3Com, but the test resulted mostly in spurious warnings.

p The performance of this driver is somewhat limited by the fact that it uses only polled-mode I/O and does not make use of the bus-mastering capability of the cards. .Sh BUGS The .Nm vx driver is known not to reset the adapter correctly following a warm boot on some systems.

p The .Nm vx driver has not been exhaustively tested with all the models of cards that it claims to support. .Sh HISTORY The .Nm vx device driver first appeared in .Fx 2.1 . It was derived from the .Nm ep driver, from which it inherits most of its limitations. .Sh AUTHOR The .Nm vx device driver and this manual page were written by Fred Gray (fgray@rice.edu), based on the work of Herb Peyerl and with the assistance of numerous others.