You haven't specified which GeForce2 IGP you have. The 32MB limit is set in silicon for the MX, MX 100, and some MX 200. It's 64MB for the some MX 200, MX 400, GTS, Pro, Ti, Ti VX, and Ultra.
It's not going to matter if you up the limit in BIOS and drivers. You would be reserving (locking up) memory that the IGP is unable to use. It would also prevent the OS from access to that reserved memory.