1Notes on the DEC FDDIcontroller 700 (DEFZA-xx) driver v.1.1.4. 2 3 4DEC FDDIcontroller 700 is DEC's first-generation TURBOchannel FDDI 5network card, designed in 1990 specifically for the DECstation 5000 6model 200 workstation. The board is a single attachment station and 7it was manufactured in two variations, both of which are supported. 8 9First is the SAS MMF DEFZA-AA option, the original design implementing 10the standard MMF-PMD, however with a pair of ST connectors rather than 11the usual MIC connector. The other one is the SAS ThinWire/STP DEFZA-CA 12option, denoted 700-C, with the network medium selectable by a switch 13between the DEC proprietary ThinWire-PMD using a BNC connector and the 14standard STP-PMD using a DE-9F connector. This option can interface to 15a DECconcentrator 500 device and, in the case of the STP-PMD, also other 16FDDI equipment and was designed to make it easier to transition from 17existing IEEE 802.3 10BASE2 Ethernet and IEEE 802.5 Token Ring networks 18by providing means to reuse existing cabling. 19 20This driver handles any number of cards installed in a single system. 21They get fddi0, fddi1, etc. interface names assigned in the order of 22increasing TURBOchannel slot numbers. 23 24The board only supports DMA on the receive side. Transmission involves 25the use of PIO. As a result under a heavy transmission load there will 26be a significant impact on system performance. 27 28The board supports a 64-entry CAM for matching destination addresses. 29Two entries are preoccupied by the Directed Beacon and Ring Purger 30multicast addresses and the rest is used as a multicast filter. An 31all-multi mode is also supported for LLC frames and it is used if 32requested explicitly or if the CAM overflows. The promiscuous mode 33supports separate enables for LLC and SMT frames, but this driver 34doesn't support changing them individually. 35 36 37Known problems: 38 39None. 40 41 42To do: 43 445. MAC address change. The card does not support changing the Media 45 Access Controller's address registers but a similar effect can be 46 achieved by adding an alias to the CAM. There is no way to disable 47 matching against the original address though. 48 497. Queueing incoming/outgoing SMT frames in the driver if the SMT 50 receive/RMC transmit ring is full. (?) 51 528. Retrieving/reporting FDDI/SNMP stats. 53 54 55Both success and failure reports are welcome. 56 57Maciej W. Rozycki <macro@linux-mips.org> 58