Well, I haven't build anything yet. I was waiting for some replies about the config to use. (see #13). And I won't be able to try anything for a week.

I'd see one theoretical scenario. Can we stop the device from rebooting if boot fails? Can we get some boot log on screen (on N900 one did this by adding "modprobe fbcon" at the beginning of /sbin/preinit)

If yes, then we could get some information where the boot fails.

/edit: Filip, did you append the device tree (.dtb) and enable the option in the kernel config? See "Device tree for dummies" for basic information. I still don't know how to enable building the .dts and .dtsi to .dtb, though.