WB(4) | Device Drivers Manual | WB(4) |
wb
— Winbond
W89C840F 10/100 Ethernet device
wb* at pci?
amphy* at mii?
The wb
driver provides support for PCI
Ethernet adapters and embedded controllers based on the Winbond W89C840F
Fast Ethernet controller chip. This includes the TRENDnet TE100-PCIE and
various other cheap boards. The 840F should not be confused with the 940F,
which is an NE2000 clone and only supports 10Mbps speeds.
The Winbond controller uses bus master DMA and is designed to be a DEC "tulip" work-alike. It differs from the standard DEC design in several ways: the control and status registers are spaced 4 bytes apart instead of 8, and the receive filter is programmed through registers rather than by downloading a special setup frame via the transmit DMA engine. Using an external PHY, the Winbond chip supports both 10 and 100Mbps speeds in either full or half duplex.
The wb
driver supports the following media
types:
The wb
driver supports the following media
options:
Note that the 100baseTX media type is only available if supported by the adapter. For more information on configuring this device, see ifconfig(8).
amphy(4), arp(4), ifmedia(4), intro(4), netintro(4), pci(4), hostname.if(5), ifconfig(8)
The wb
device driver first appeared in
FreeBSD 3.0. OpenBSD support
first appeared in OpenBSD 2.5.
The wb
driver was written by
Bill Paul
<wpaul@ctr.columbia.edu>.
The Winbond chip seems to behave strangely in some cases when the
link partner switches modes. If, for example, both sides are set to 10Mbps
half-duplex, and the other end is changed to 100Mbps full-duplex, the
Winbond's receiver suddenly starts writing trash all over the RX
descriptors. The wb
driver handles this by forcing a
reset of both the controller chip and attached PHY. This is drastic, but it
appears to be the only way to recover properly from this condition.
July 16, 2013 | OpenBSD-current |