[3c509] 920-BR06: Media does not come online

miim webmaster xxdpplus at yahoo.com
Fri Jan 27 03:49:10 PST 2006

This problem was seen on Debian 3.1r1, with the
2.6-8 distributed kernel.  The gross symptom is
that the media interface never comes on line
(neither the 10/100 LED or the data transfer LED
ever light up.)

The network interface is a 3Com 920-BR06, integrated
on a Micron BCMFX810E, also known as a DFI DF701 --
based on the Intel 810E chipset.  The 3Com diagnostic
program 3C90XCFG.EXE reports this chip as a 3C905C-TX.

The board passes the 3Com internal diagnostics
but fails the media autoconfigure test (with a
cable plugged in and connected to a Linksys
firewall).  The same problem occurs if I plug
directly onto the LAN, so it doesn't appear to
be a problem with the router/firewall.

The problem is consistent across the 3 boards
I have, so it does not appear to be a failure
on the board.  The 3Com diagnostic reports:

3C905C-TX bus 1 Dev/slot 3:
Node address 00 C0 A8 F1 0B C9
Ehterlink 10/100 PCI NIC
"The media type cannot be automatically selected
at this time because the NIC is not connected to
a network."

The Linux driver recognizes the chip, but appears
to be unable to bring the media interface up.

SYSLOG reports the following:
PCI: Found IRQ10 for device 0000:01:03.0
PCI: Sharing IRQ10 with 0000:00:01.0
3c59x: Donald Becker and others,
PCI: 0000:01:03.0: 3Com PCI 3C905C Tornado
      at 0xbc00. Vers LK1.1.19

ifconfig reports the following:

Link encap: Ethernet
HW addr: 00:C0:A8:F1:0B:C9
inet addr:
inet6 addr: fc80:2C0:A8ff:FEF1:BC9/64
Scope: Link
metric: 1
RX packets: 0 errors: 0 dropped: 0 overruns: 0 frame:0
TX packets:313 errors:0 dropped:0 overruns:0
    collisions:0 txquelen:1000
RX byte: 0 (0.0B)
TX bytes: 18858 (18.4 KiB)

issuing "ifconfig eth0 media auto" produces
auto: Host name lookup failure
(I seem to have misunderstood the syntax of this

And, of course, attempting to ping the firewall fails.

I seem to remember when I looked at this a couple of
back that the 920-BR06 had a bad reputation for not
online properly.  However, I can't find any references
that on the net or in the newsgroups.

If anyone can offer advice, or would like to chase
problem, I'd be glad to hear from you.

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