and, as it seems to work, some few words about the idea i made to myself for this:
the ethernet board is using a driver for tulip/davicom, which is not compatible...
to figure out what i had to blacklist i scrutinized the system log with KsystemLog (wonderfull tool) filtering for dmfe.
09/15/2008 11:35:37 AM piccolo NetworkManager <info> eth0: Device is fully-supported using driver 'dmfe'.
09/15/2008 11:35:40 AM piccolo kernel [ 69.321974] dmfe: Change Speed to 100Mhz full duplex
09/15/2008 01:37:53 PM piccolo kernel [ 29.926668] dmfe: Davicom DM9xxx net driver, version 1.36.4 (2002-01-17)
09/15/2008 01:38:01 PM piccolo NetworkManager <info> eth0: Device is fully-supported using driver 'dmfe'.
The sistem loads a standard eth0: driver, then a tulip/davicom but says the magic number to blacklist

seems still working...
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