When using multiboot, when boot with keyboard open, it displays menu. Then, after selecting item, it makes a flash of selected kernel into kernel area( source: http://forums.internettablettalk.com...4&postcount=10 - Stskeeps is "Official maintainer of the MeeGo Nokia N900 hardware adaptation" as does his signature say, so I guess he's reliable ), phone looks like it reboots (black screen for a second, then Nokia logo like on power on) and it loads the system like there was no multiboot. And in package multiboot-kernel-power nad kernel-power the hashes of kernels (zImage and vmlinuz) are the same, so I guess this is just a naming convention. And, when replacing the vmlinuz image of old kernel-power with your kernel, it just works. If you could do that package, I will test and report you how it works