1 .\" Copyright (c) 1997, 1998
2 .\" Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
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38 .Nd "VIA Technologies Rhine I/II/III Ethernet device driver"
45 driver provides support for PCI Ethernet adapters and embedded
46 controllers based on the VIA Technologies VT3043 Rhine I,
47 VT86C100A Rhine II, and VT6105/VT6105M Rhine III Fast Ethernet
50 The VIA Rhine chips use bus master DMA and have a descriptor layout
51 designed to resemble that of the DEC 21x4x
55 layout is different however and the receive filter in the Rhine chips
56 is much simpler and is programmed through registers rather than by
57 downloading a special setup frame through the transmit DMA engine.
58 Transmit and receive DMA buffers must be longword
60 The Rhine chips are meant to be interfaced with external
61 physical layer devices via an MII bus.
63 10 and 100Mbps speeds in either full or half duplex.
67 driver supports the following media types:
69 .Bl -tag -width xxxxxxxxxxxxxxxxxxxx
71 Enable autoselection of the media type and options.
72 The user can manually override
73 the autoselected mode by adding media options to the
80 option can also be used to select either
86 Set 100Mbps (Fast Fthernet) operation.
89 option can also be used to select either
98 driver supports the following media options:
100 .Bl -tag -width xxxxxxxxxxxxxxxxxxxx
102 Force full duplex operation
104 Force half duplex operation.
107 Note that the 100baseTX media type is only available if supported
109 For more information on configuring this device, see
114 driver supports VIA Technologies Rhine I, Rhine II, and Rhine III based
115 Fast Ethernet adapters including:
121 Hawking Technologies PN102TX
127 .It "vr%d: couldn't map memory"
128 A fatal initialization error has occurred.
129 .It "vr%d: couldn't map interrupt"
130 A fatal initialization error has occurred.
131 .It "vr%d: watchdog timeout"
132 The device has stopped responding to the network, or there is a problem with
133 the network connection (cable).
134 .It "vr%d: no memory for rx list"
135 The driver failed to allocate an mbuf for the receiver ring.
136 .It "vr%d: no memory for tx list"
137 The driver failed to allocate an mbuf for the transmitter ring when
138 allocating a pad buffer or collapsing an mbuf chain into a cluster.
139 .It "vr%d: chip is in D3 power state -- setting to D0"
140 This message applies only to adapters which support power
142 Some operating systems place the controller in low power
143 mode when shutting down, and some PCI BIOSes fail to bring the chip
144 out of this state before configuring it.
145 The controller loses all of
146 its PCI configuration in the D3 state, so if the BIOS does not set
147 it back to full power mode in time, it won't be able to configure it
149 The driver tries to detect this condition and bring
150 the adapter back to the D0 (full power) state, but this may not be
151 enough to return the driver to a fully operational condition.
153 you see this message at boot time and the driver fails to attach
154 the device as a network interface, you will have to perform second
155 warm boot to have the device properly configured.
157 Note that this condition only occurs when warm booting from another
159 If you power down your system prior to booting
161 the card should be configured correctly.
170 .%T The VIA Technologies VT86C100A data sheet
171 .%O http://www.via.com.tw
176 device driver first appeared in
181 driver was written by
182 .An Bill Paul Aq wpaul@ctr.columbia.edu .
186 driver always copies transmit mbuf chains into longword-aligned
187 buffers prior to transmission in order to pacify the Rhine chips.
188 If buffers are not aligned correctly, the chip will round the
189 supplied buffer address and begin DMAing from the wrong location.
190 This buffer copying impairs transmit performance on slower systems but can't
192 On faster machines (e.g.\& a Pentium II), the performance
193 impact is much less noticeable.