FXP(4)                    NetBSD Programmer's Manual                    FXP(4)

NAME
     fxp - Intel i8255x 10/100 Ethernet device driver

SYNOPSIS
     fxp* at cardbus? dev ? function ?
     fxp* at pci? dev ? function ?

DESCRIPTION
     The fxp device driver supports Ethernet interfaces based on the Intel
     i82557, i82558, i82559, and i82550 10/100 PCI Ethernet chips.

     Certain versions of the i8255x support loading microcode which implements
     a receive interrupt mitigation function, known as ``CPUSaver''.  Use of
     this option can improve performance in some situations by reducing inter-
     rupt load on the host.  This option is available on the following chip
     versions:

     +   i82558 step A4 (rev 4)
     +   i82558 step B0 (rev 5)
     +   i82559 step A0 (rev 8)
     +   i82559S step A (rev 9)
     +   i82550 (rev 12)
     +   i82550 step C (rev 13)

     This option is enabled by setting the ``link0'' option with ifconfig(8).

HARDWARE
     Cards supported by the fxp driver include:

     +   Intel EtherExpress Pro 10+
     +   Intel EtherExpress Pro 100B
     +   Intel EtherExpress Pro 100+
     +   Intel InBusiness 10/100
     +   Intel PRO/100 S

MEDIA SELECTION
     Media selection is supported via MII.  See ifmedia(4) and mii(4) for more
     information.

     EtherExpress Pro 10+ boards may use a Seeq 80c24 AutoDUPLEX(tm) media in-
     terface.  Boards with these chips do not support media selection, as the
     80c24 has no programming interface, and no way to read link status.
     These boards claim a media of "manual" since they self-configure based on
     the configuration of the link partner (hub or switch).

DIAGNOSTICS
     fxp0: WARNING: SCB timed out!  The driver timed out waiting for the
     chip's command interface to become ready.

     fxp0: too many segments, aborting  The driver encountered a packet that
     included too many DMA segments, and was not able to allocate a new buffer
     to transmit the packet from.  The packet has been dropped.

     fxp0: too many segments, retrying  The driver encountered a packet that
     included too many DMA segments, and allocated a new buffer to transmit
     the packet from.

     fxp0: can't load mbuf chain, error = %d  The driver was unable to load a
     transmit DMA map, and has reported the errno value.

     fxp0: device timeout  The device failed to generate a transmit complete
     interrupt for the last packet transmitted.  The device has been reset.

     fxp0: can't load rx buffer, error = %d  The driver was unable to load the
     DMA map for a receive buffer, and has reported the errno value.  This er-
     ror is currently fatal, and will panic the system.

     fxp0: fxp_mdi_read: timed out  The MDIO failed to become ready during an
     MII read operation.

     fxp0: fxp_mdi_write: timed out  The MDIO failed to become ready during an
     MII write operation.

SEE ALSO
     cardbus(4), ifmedia(4), intro(4), mii(4), pci(4), ifconfig(8)

NetBSD 1.6                       April 5, 2002                               2

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