It simply does not exist for 82559* in all the steppings.
eepro100 is pretty poor device.
Probably, it exists for card identified as Gamla (D102) (82559 is
I have code from Audrey to enable HWCK for received only and code
from you for SG -- but no way to enable HWCK for TX. The Intel
provided drivers themselves don't seem to have any way of doing this
so i wonder if it is either undocumented so Intel can sell the same
hardware at a premium (as they do for NT, the only different being
drivers) or simply because the HW is poor.
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