Comment 6 for bug 1640519

I think you're confusing flash-kernel and u-boot-tools. u-boot-tools doesn't provide any kernel hooks AFAIK -- they're all in flash-kernel. And AFAIK flash-kernel will only crash in the way we've seen here if it detects that the platform it's running on requires a uImage, but u-boot-tools isn't installed. So AFAICT it's absolutely safe to install u-boot-tools everywhere, and probably safe to install flash-kernel everywhere. The crash occurs when flash-kernel is installed but some of the things it tries to run on the current platform are not.