Not quite sure, I just asked mbuesch for a copy of his working .config and used that (attached), but I haven't gone over the diff from the menuconfig-produce one yet (it's quite large).

Even with this the build failed in a few places. I had to add libusb-1.0 to gpsd's PKG_BUILD_DEPENDS and disable gpxview & nfs-utils, YMMV. In case it matters the successful build was at r23088.

Once you boot, X will start with a black root window and nothing else, which may look like it's broken if you expect to see the classic root weave pattern or a mouse pointer for example. Apparently you can autostart clients via /etc/config/x11 but I don't know the details yet. Setting $DISPLAY and starting stuff from an ssh session works of course.

By modifying the rootfs /etc/config/wireless on a PC before putting it in the N810. You need to remove the "option disabled 1" line, and set the ssid and encryption details.

BTW, it will use a 00:02:ee:c0:ff:ee MAC address by default (that's also in a range registered to Nokia but is nothing like the address used under Diablo). That's something to watch out for if for instance you have MAC filters on your AP or reject unknown clients on your DHCP server. Dropbear is started automatically at boot time.

Oh, and USB is not currently working so spare yourself the trouble of trying to set up a USB console or networking.