Although the driver for the 3c905c isn't included quite yet
in the standard kernel tree, you probably want to consider
including the newest version of the 3c59x module from Don
Becker's site. The 905C is currently being actively shipped
on Dell machines, although I do not believe it is currently
shipping according to 3com.
This driver is included in the 2.2.12-20 kernel package. Feel free to
close this bug.