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Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
if_ed_load="YES"
In addition to the standard port and IRQ specifications, the ed driver also supports a number of flags which can force 8/16bit mode, enable/disable multi-buffering, and select the default interface type (AUI/BNC, and for cards with twisted pair, AUI/10BaseT).
The flags are a bit field, and are summarized as follows:
| 0x01 | Disable transceiver. On those cards which support it, this flag causes the transceiver to be disabled and the AUI connection to be used by default. |
| 0x02 | Force 8bit mode. This flag forces the card to 8bit mode regardless of how the card identifies itself. This may be needed for some clones which incorrectly identify themselves as 16bit, even though they only have an 8bit interface. This flag takes precedence over force 16bit mode. |
| 0x04 | Force 16bit mode. This flag forces the card to 16bit mode regardless of how the card identifies itself. This may be needed for some clones which incorrectly identify themselves as 8bit, even though they have a 16bit ISA interface. |
| 0x08 | Disable transmitter multi-buffering. This flag disables the use of multiple transmit buffers and may be necessary in rare cases where packets are sent out faster than a machine on the other end can handle (as evidenced by severe packet lossage). Some ( non-Fx :-)) machines have terrible Ethernet performance and simply cannot cope with 1100K+ data rates. Use of this flag also provides one more packet worth of receiver buffering, and on 8bit cards, this may help reduce receiver lossage. |
When using a 3c503 card, the AUI connection may be selected by specifying the link2 option to ifconfig(8) (BNC is the default).
ISA, PCI and PC Card devices are supported.
The ed driver does not support the following Ethernet NICs:
| ed%d: failed to clear shared memory at %x - check configuration. | When the card was probed at system boot time, the ed driver found that it could not clear the card's shared memory. This is most commonly caused by a BIOS extension ROM being configured in the same address space as the Ethernet card's shared memory. Either find the offending card and change its BIOS ROM to be at an address that does not conflict, or change the settings in device.hints(5) that the card's shared memory is mapped at a non-conflicting address. |
| ed%d: Invalid irq configuration (%d) must be 2-5 for 3c503. | The IRQ number that was specified in the device.hints(5) file is not valid for the 3Com 3c503 card. The 3c503 can only be assigned to IRQs 2 through 5. |
| ed%d: Cannot find start of RAM.
ed%d: Cannot find any RAM, start : %d, x = %d. | |
| The probe of a Gateway card was unsuccessful in configuring the card's packet memory. This likely indicates that the card was improperly recognized as a Gateway or that the card is defective. | |
| ed: packets buffered, but transmitter idle. | Indicates a logic problem in the driver. Should never happen. |
| ed%d: device timeout | Indicates that an expected transmitter interrupt did not occur. Usually caused by an interrupt conflict with another card on the ISA bus. This condition could also be caused if the kernel is configured for a different IRQ channel than the one the card is actually using. If that is the case, you will have to either reconfigure the card using a DOS utility or set the jumpers on the card appropriately. |
| ed%d: NIC memory corrupt - invalid packet length %d. | Indicates that a packet was received with a packet length that was either larger than the maximum size or smaller than the minimum size allowed by the IEEE 802.3 standard. Usually caused by a conflict with another card on the ISA bus, but in some cases may also indicate faulty cabling. |
| ed%d: remote transmit DMA failed to complete. | This indicates that a programmed I/O transfer to an NE1000 or NE2000 style card has failed to properly complete. Usually caused by the ISA bus speed being set too fast. |
| ed%d: Invalid irq configuration (%ld) must be %s for %s | Indicates the device has a different IRQ than supported or expected. |
| ed%d: Cannot locate my ports! | The device is using a different I/O port than the driver knows about. |
| ed%d: Cannot extract MAC address | Attempts to get the MAC address failed. |
| ed%d: Missing mii! | Probing for an MII bus has failed. This indicates a coding error in the PC Card attachment, because a PHY is required for the chips that generate this error message. |
The NIC memory access to 3Com and Novell cards is much slower than it is on WD/SMC cards; it is less than 1MB/second on 8bit boards and less than 2MB/second on the 16bit cards. This can lead to ring-buffer overruns resulting in dropped packets during heavy network traffic.
The Mitsubishi B8895 PC Card uses a DP83902, but its ASIC part is undocumented. Neither the NE2000 nor the WD83x0 drivers work with this card.
The ed driver is slow by today's standards.
PC Card attachment supports the D-Link DMF650TX LAN/Modem card's Ethernet port only at this time.
Some devices supported by ed do not generate the link state change events used by devd(8) to start dhclient(8). If you have problems with dhclient(8) not starting and the device is always attached to the network it may be possible to work around this by changing "DHCP" to "SYNCDHCP" in the ifconfig_ed0 entry in /etc/rc.conf.
| ED (4) | October 24, 2018 |
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