Provided by: freebsd-manpages_12.2-1_all bug


     ep — Ethernet driver for 3Com Etherlink III (3c5x9) interfaces


     To compile this driver into the kernel, place the following line in your kernel
     configuration file:

           device ep

     Alternatively, to load the driver as a module at boot time, place the following line in



     The ep driver is not present in FreeBSD 13.0 and later.  See for more information.


     The ep device driver supports network adapters based on the 3Com 3C5x9 Etherlink III
     Parallel Tasking chipset.

     Various models of these cards come with a different assortment of connectors:

     AUI/DIX               Standard 15 pin connector, also known as 10base5 (thick-net)

     10Base2               BNC, also known as thin-net

     10BaseT               UTP, also known as twisted pair

     The default port to use is the port that has been selected with the setup utility.  To
     override this, use the following media options with ifconfig(8) or in your /etc/rc.conf

     10base5/AUI           Use the AUI port.

     10base2/BNC           Use the BNC port.

     10baseT/UTP           Use the UTP port.


     The ep driver supports Ethernet adapters based on the 3Com 3C5x9 Etherlink III Parallel
     Tasking chipset, including:

        3Com 3C1 CF
        3Com 3C509-TP, 3C509-BNC, 3C509-Combo, 3C509-TPO, 3C509-TPC ISA
        3Com 3C509B-TP, 3C509B-BNC, 3C509B-Combo, 3C509B-TPO, 3C509B-TPC ISA
        3Com 3C562/3C563 PCMCIA
        3Com 3C574, 3C574TX, 3C574-TX, 3CCFE574BT, 3CXFE574BT, 3C3FE574BT PCMCIA
        3Com 3C589, 3C589B, 3C589C, 3C589D, 3CXE589DT PCMCIA
        3Com 3CCFEM556B, 3CCFEM556BI PCMCIA
        3Com 3CXE589EC, 3CCE589EC, 3CXE589ET, 3CCE589ET PCMCIA
        3Com Megahertz 3CCEM556, 3CXEM556, 3CCEM556B, 3CXEM556B, 3C3FEM556C PCMCIA
        3Com OfficeConnect 3CXSH572BT, 3CCSH572BT PCMCIA
        Farallon EtherWave and EtherMac PC Card (P/n 595/895 with BLUE arrow)


     The 3c509 card has no jumpers to set the address.  3Com supplies software to set the address
     of the card in software.  To find the card on the ISA bus, the kernel performs a complex
     scan operation at IO address 0x110.  Beware!  Avoid placing other cards at that address!

     Furthermore, the 3c509 should not be configured in EISA mode.

     Cards in PnP mode may conflict with other resources in the system.  Ensure your BIOS is
     configured correctly to exclude resources used by the 3c509, especially IRQs, to avoid
     unpredictable behavior.

     Many different companies sold the 3Com PC Cards under their own private label.  These cards
     also work.

     The Farallon EtherWave and EtherMac card came in two varieties.  The ep driver supports the
     595 and 895 cards.  These cards have the blue arrow on the front along with a 3Com logo.
     The Farallon 595a cards, which have a red arrow on the front, are also called EtherWave and
     EtherMac.  They are supported by the sn(4) driver.


     ep0: reset (status: %x)  The driver has encountered a FIFO underrun or overrun.  The driver
     will reset the card and the packet will be lost.  This is not fatal.

     ep0: eeprom failed to come ready  The eeprom failed to come ready.  This probably means the
     card is wedged.

     ep0: 3c509 in test mode. Erase pencil mark!  This means that someone has scribbled with
     pencil in the test area on the card.  Erase the pencil mark and reboot.  (This is not a

     ep0: No I/O space?!  The driver was unable to allocate the I/O space that it thinks should
     be there.  Look for conflicts with other devices.

     ep0: No irq?!  The driver could not allocate the interrupt it wanted.  Look for conflicts,
     although sharing interrupts for PC Card is normal.

     ep0: No connectors!  The driver queried the hardware for what ethernet attachment were
     present, but the hardware reported none that the driver recognized.

     ep0: Unable to get Ethernet address!  The driver was unable to read the ethernet address
     from the EEPROM.  This is likely the result of the card being wedged.

     ep0: if_alloc() failed  The driver was unable to allocate a ifnet structure.  This may
     happen in extremely low memory conditions.

     ep0: strange connector type in EEPROM: assuming AUI  The driver does not know what to do
     with the information the EEPROM has about connectors, so it is assuming the worst.

     ep0: unknown ID 0xXXXXXXXX  The driver has found an ID that it believes it supports, but
     does not have a specific identification string to present to the user.

     ep0: <%s> at port 0x%03x in EISA mode, ignored.  The 3C509 ISA card is in EISA mode.  The
     card will be ignored until it is taken out of EISA mode.

     ep0: <%s> at x0%03x in PnP mode  This card appears to be in Plug and Play mode.  It should
     be probed as part of the plug and play phase of the ISA probes.

     ep0: Invalid EEPROM checksum!  The EEPROM has a bad checksum, so the driver is ignoring the

     ep0: bus_setup_intr() failed!  The driver was unable to setup the interrupt handler.  This
     should never happen.


     altq(4), ed(4), intro(4), ng_ether(4), sn(4), vx(4), ifconfig(8)


     are great.  There is so many to choose from.