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.