Christoph Hellwig writes:

Or have a gige chip that's crippled to do only 10/100, like the sungem
on my ibook.

I think it is not that the sungem itself is crippled, rather that the
phy can only do 10/100.  I agree that the division between 10/100 and
gigabit ethernet is pretty useless.  I note that sungem didn't get put
in the gigabit list, for instance.

Paul.