Nope, I don't apply any overclock patches or whatever. Just un-edited downloads from OpenWRT source.
23.x runs fine, but with 24.x or snapshots ETH1 refuses to come online. Tried again today, but no succes. Even with different SD-card, cable or powersupply, outcome stays the same.
Guess I'll stick with 23.x now, it runs fine. Will try again when 24.x comes out of beta.