About the subject of the thread - power kernel comes with u-boot since its maintainer, titan, chose so. Since it is free software you have a few options if you are unhappy with his choice, even without giving up the benefits of the power kernel:

1. You can create you own power 45 kernel image without u-boot, as Fabry did.
2. You can change the source package to generate a u-boot-less image, and distribute the package (with name changed) for users who feel like you.
3. You can change the source package to generate two images, one with and one without u-boot (it is easy) and offer this change to titan so that two kernel image packages will be created, and users will have a choice of which package to install. I don't know if titan will accept such a patch, but it has a better chance than merely asking for not including u-boot.