This page contains information on using Linux with 100VG networks.
The drivers currently support the following cards:
The source of the driver is in pci-100vg.c.
A pre-compiled installable module for Linux 1.2.13 is in
- HP J2585 PCI 100VG adapter
- This PCI adapter has the ATT2MD11 chip and two RJ45 jacks, one each for
10baseT and 100VG. The major chip isn't labeled 2MD11, but instead
1242K, 1821-1707, YYMM 55739402. The smaller chip is the ATT2X01 100VG
- HP J2573 ISA 100VG adapter
- This ISA adapter has the ATT2MD01 chip and two RJ45 jacks, one each for
10baseT and 100VG. The major chip isn't labeled 2MD01, but instead
100VG, 1821-1400, YYMM 5556040. The smaller chips are the ATT2X01 100VG
transceiver, i82503 10baseT transceiver and two Cypress CY7C199-20 SRAM
chips. Also on the board is a socket for a boot ROM.
No errata have been noted as of 8/22/95.
This is an ugly chipset. HP and AT&T obviously put their engineering
effort into the physical transmission layer, and ignored the software
interface. While users can usually be sheltered from chipset ugliness, in
this case there a few of the bad design decisions can't be worked around.
- The chip provides no per-packet transmit status. This omission means
that, in violation of my informal Linux netcard statistics specification,
packets are counted as transmitted successfully when they are queued for
transmission rather than when they are actually transmitted. This could be
worked around at the cost of significantly higher driver overhead, but it's
still impossible to get transmit deferral, collision or accurate transmit
carrier error statistics.
Compatibility: Ethercards reported to use the ATT2MD** chips
Thus far only 100VG boards I've seen have been from HP.
- HP J2585 PCI adapter.
The master copy of this page resides on the
This driver was written to support the Beowulf cluster project at CESDIS.
For Beowulf-specific information, read the
Beowulf project description.
is located at the
Goddard Space Flight Center in Greenbelt MD.
Author:Donald Becker, firstname.lastname@example.org.