Afaik there's no kernel-side sound driver for the N810 hw codec, but there is for the N800. I imagine one could write one for the N810 (they are not that dissimilar afaict), but my preference would be to ask Nokia if they have one (if they did Fremantle dev work on the N810 and were using the PulseAudio ARM-side approach).

More troublesome, from a chat with Solca, is that the cpufreq stuff for the OMAP2 devices has been dropped from the latest kernels (due to no maintainer I think). This will be a real pain if we want to go up-to-date on the N8x0 tablets and retain some decent battery life.