Er, what's SDIO got to do with this? From the N800's point of view I mean.

As for trying to set up the N800 as an access point I think I would instead simply go for bying a wi-fi router. They're quite cheap these days and there's not much that can go wrong (except that there are a few wi-fi routers out there that don't play nicely with the N8x0's wi-fi power saving mode).

Of course that wouldn't work out in the field. The question is then if the camera can do wi-fi ad-hoc mode. This would be easier to figure out if we knew which camera this is about..