Tested at 100Mbit only, using Asus P4P800 onboard 3C940.
The -stable version of this patch I have in use for ~2 weeks now, and works
just fine for me.
Based on: Nathan L. Binkert's patch for OpenBSD
Patch submitted by and thanks to: Jung-uk Kim <jkim@niksun.com>
MFC after: 2 weeks
Parag Patel did all of the grunt work, so he gets the credit.
Register definitions and actions inferred from a Linux driver,
so Intel also gets some 'credit'.