I don't use multiboot but this http://wiki.maemo.org/Kernel_Power#I...d_installation
might help.

The zImage needed for multiboot and u-boot is provided by kernel-power-bootimg.
I plan to make kernel-power a u-boot image by default in the future.

regarding camera problems: it seems fcam-drivers needs to be recompiled. uninstalling fcam+fcam-drivers makes the camera work for me.