Tulip Full-Duplex problem

My lab has a machine running Linux 2.2.18 with DS 21143 Tulip Adapter.
We have a problem in setting the media type of the NIC to
Full-Duplex mode, and would like to ask for your advices.

The NIC is fine when the system is just rebooted. Using 'tulip-diag', I
found that the port selection of the NIC is "MII, full-duplex"; and
using 'mii-diag', I found that the auto-negotioation is enabled and the
autonegotiated media type is 100baseTx-FD.

Well, then if I turn off the ethernet interface by using 'ifconfig eth#
down'
and then bring it up again. The NIC media type detected by 'tulip-diag' is
"MII, half-duplex", while the 'mii-diag' returns the same result as before.
Then the NIC is in trouble with a lot of Tx packets errors. I have try
to enforce the NIC Full-Duplex mode by using 'tulip-diag' with option "-F",
it did not work; neither did the 'mii-diag'.

Any suggection is welcome.

Thanks,

-congchun


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