WB(4) BSD Kernel Interfaces Manual WB(4)
NAME
wb -- Winbond W89C840F Fast Ethernet device driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device miibus
device wb
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
if_wb_load="YES"
DESCRIPTION
The wb driver provides support for PCI Ethernet adapters and embedded controllers based on the Winbond W89C840F Fast Ethernet controller
chip. 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' workalike. 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:
autoselect Enable autoselection of the media type and options. This is only supported if the PHY chip attached to the Winbond
controller supports NWAY autonegotiation. The user can manually override the autoselected mode by adding media options
to the /etc/rc.conf file.
10baseT/UTP Set 10Mbps operation. The mediaopt option can also be used to select either full-duplex or half-duplex modes.
100baseTX Set 100Mbps (Fast Ethernet) operation. The mediaopt option can also be used to select either full-duplex or
half-duplex modes.
The wb driver supports the following media options:
full-duplex Force full duplex operation
half-duplex Force half duplex operation.
Note that the 100baseTX media type is only available if supported by the adapter. For more information on configuring this device, see
ifconfig(8).
HARDWARE
The wb driver supports Winbond W89C840F based Fast Ethernet adapters and embedded controllers including:
o Trendware TE100-PCIE
DIAGNOSTICS
wb%d: couldn't map memory A fatal initialization error has occurred.
wb%d: couldn't map interrupt A fatal initialization error has occurred.
wb%d: watchdog timeout The device has stopped responding to the network, or there is a problem with the network connection (cable).
wb%d: no memory for rx list The driver failed to allocate an mbuf for the receiver ring.
wb%d: no memory for tx list The driver failed to allocate an mbuf for the transmitter ring when allocating a pad buffer or collapsing an
mbuf chain into a cluster.
wb%d: chip is in D3 power state -- setting to D0 This message applies only to adapters which support power management. Some operating sys-
tems place the controller in low power mode when shutting down, and some PCI BIOSes fail to bring the chip out of this state before configur-
ing it. The controller loses all of its PCI configuration in the D3 state, so if the BIOS does not set it back to full power mode in time,
it will not be able to configure it correctly. The driver tries to detect this condition and bring the adapter back to the D0 (full power)
state, but this may not be enough to return the driver to a fully operational condition. If you see this message at boot time and the driver
fails to attach the device as a network interface, you will have to perform second warm boot to have the device properly configured.
Note that this condition only occurs when warm booting from another operating system. If you power down your system prior to booting
FreeBSD, the card should be configured correctly.
SEE ALSO
arp(4), miibus(4), netintro(4), ng_ether(4), ifconfig(8)
HISTORY
The wb device driver first appeared in FreeBSD 3.0.
AUTHORS
The wb driver was written by Bill Paul <wpaul@ctr.columbia.edu>.
BUGS
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.
BSD July 16, 2005 BSD