@marmistrz: I suggested earlier: first to install it on eMMC or SD card and then start thinking how to fit it into nand. I think best way would be to move /usr on eMMC, but this has one big problem that udev does not working with separate /usr and /. So before starting init /usr should be mounted. But mounting from fstab is done after udev... so still we need some /sbin/preinit hack for this...