EP(4)							 BSD/i386 Kernel Interfaces Manual						     EP(4)

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

SYNOPSIS
     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 loader.conf(5):

	   if_ep_load="YES"

DESCRIPTION
     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 file.

     10base5/AUI	   Use the AUI port.

     10base2/BNC	   Use the BNC port.

     10baseT/UTP	   Use the UTP port.

     If there are multiple cards in the computer, they are searched for in the following order: bus, slot, then Ethernet address.

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

     o	 3Com 3C1 CF
     o	 3Com 3C509-TP, 3C509-BNC, 3C509-Combo, 3C509-TPO, 3C509-TPC ISA
     o	 3Com 3C509B-TP, 3C509B-BNC, 3C509B-Combo, 3C509B-TPO, 3C509B-TPC ISA
     o	 3Com 3C529, 3C529-TP MCA
     o	 3Com 3C562/3C563 PCMCIA
     o	 3Com 3C569B-J-TPO, 3C569B-J-COMBO CBUS
     o	 3Com 3C574, 3C574TX, 3C574-TX, 3CCFE574BT, 3CXFE574BT, 3C3FE574BT PCMCIA
     o	 3Com 3C579-TP, 3C579-BNC EISA
     o	 3Com 3C589, 3C589B, 3C589C, 3C589D, 3CXE589DT PCMCIA
     o	 3Com 3CCFEM556B, 3CCFEM556BI PCMCIA
     o	 3Com 3CXE589EC, 3CCE589EC, 3CXE589ET, 3CCE589ET PCMCIA
     o	 3Com Megahertz 3CCEM556, 3CXEM556, 3CCEM556B, 3CXEM556B, 3C3FEM556C PCMCIA
     o	 3Com OfficeConnect 3CXSH572BT, 3CCSH572BT PCMCIA
     o	 Farallon EtherWave and EtherMac PC Card (P/n 595/895 with BLUE arrow)

NOTES
     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 only be configured in EISA mode when installed in a computer that has actual EISA slots (and an EISA-aware
     BIOS).  The normal driver auto-detection support is sufficient for non-EISA systems.

     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.

DIAGNOSTICS
     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 pen-
     cil mark and reboot.  (This is not a joke).

     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 connec-
     tors, 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  The 3C509 ISA card is in EISA mode.  This message appears to be purely informational.

     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 card.

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

SEE ALSO
     altq(4), ed(4), el(4), ie(4), intro(4), ng_ether(4), sn(4), vx(4), ifconfig(8)

STANDARDS
     are great.  There is so many to choose from.

BUGS
     Support for the 3Com 3C1 CompactFlash is not working.

BSD								  January 1, 2008							       BSD