Ben,
Don't know if it's of any interest but here's "The Rest of the
Story"....The 3C90x1 driver from the 3Com site is the correct driver
to use. That package (it's 3Com90xv54 after expanding) has the
driver for the 3C920B interface which has been specifically used by
"VIA" and has also been "EMB"edded into other chip makers South
bridges. 3Com's interface is used for Media Access Control and is
paired with an external AC101L E-Net Controller by Broadcom (Altima).
The driver/Technology is a few years old! A similar technology is
used for the Nvidia port.