Moving from Gen kernel to manual kernels

[Foszoe]

Until this install on my laptop, I had always used manual kernel builds. Because I wanted a quicker start up, I went with Genkernel. Then . I built a manual kernel to begin streamlining for my specific computer using the configuration file from the genkernel.

Is there a way to get my manual kernel to run without calling the initramfs?

[szatox]

Yes. There is even way to get genkernel to work without initramfs.
The fact that genkernel builds one for you doesn't mean you must use it. Just remove it from bootloader's config to skip that part. Well, actually you will likely have to change a few other options too, but the most important part it root=<device> and init=<init script>.

Of course, if you don't want to use initramfs, your actual root must contain all files needed for system init. And it must be understandable by bootloader. This means no encryption, no lvm, no raid, nothing but plain disk with plain partition table and at most the optional parts like /home, /opt, /var and swap split out to other drives. And all necessary things must be built in kernel directly, and not as loadable modules. Like disk drive controller driver for example.

Btw, the most funny part is you can copy .config from genkernel and use it to build another kernel manually. It will work just as fine, though it won't create initramfs for you in the process.

[Tony0945]

[Foszoe]

When grub sees an initramfs, does it add it to every kernel it finds in the /boot directory when it writes grub.cfg?

If so is it a matter of commenting it out or is there a more elegant method to handle it?

I have a simple /ext4 with /swap install. Is there any advantage to having a initramfs for me?

can multiple kernels use the same initramfs when the .config for each kernel is different?

Thanks for any assistance in helping me understand these two items.

[szatox]