Checksum error on 3com 905c card.

[Mikael Rosbacke]

I have a 3c905c card in a computer running redhat 6.1 with kernel
2.2.14. When I try to PING it from another computer running Win98 it
will not respond properly. A fraction of the packets are responded
but most of the vanish (>80%). I do not have the same problem when
trying to access the computer from another box running linux on the
same network.

During boot of the computer I get the following message in the
message log:

Jan 29 18:24:25 system kernel: 3c59x.c:v0.99H 11/17/98 Donald Becker
http://cesdis.gsfc.nasa.gov/linux/drivers/vortex.html
Jan 29 18:24:25 system kernel: eth0: 3Com 3c905C Tornado at 0xf880,
***INVALIDCHECKSUM 002f***  00:50:04:d0:50:e4, IRQ 9
Jan 29 18:24:25 system kernel:   8K byte-wide RAM 5:3 Rx:Tx split,
autoselect/100baseTX interface.
Jan 29 18:24:25 system kernel:   Enabling bus-master transmits and
whole-frame receives.  

The proc filesystem reports an 'unknown 3com card' instead of 3c905c.

The invalid checksum, is that an indication of broken hardware, or is
there another explanation/workaround to get the card working?

--- Mikael Rosbacke



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