The manual install guide is good to go, but the stage4 install guide is still being worked on.
Now we need to set things up for a real-time kernel. We start by setting a keyword for the kernel:
> nano /etc/portage/package.keywords/sys-kernel
Add this line:
Now emerge the kernel sources and firmware package:
> emerge rt-sources linux-firmware
Make sure the linux sources symlink exists:
> ln -s /usr/src/linux[TAB_COMPLETION] /usr/src/linux
Gentoo Studio uses genkernel. It works the same way SystemRescueCD works, by detecting hardware at boot. You will need to have any and all MIDI and audio interfaces plugged in and turned on before booting once you have finished installing Gentoo Studio. Also note that genkernel is not a guarantee that your device will work. It is up to you to know whether your device is supported on Linux. If you know your device is supposed to work but doesn't, post to the Gentoo Studio sticky on forums.gentoo.org in the Multimedia section.
> emerge genkernel
Now configure fstab for genkernel:
> nano /etc/fstab
Change the line for BOOT to look like:
/dev/sda2 /boot ext2 defaults 0 2
genkernel --menuconfig --install all
It's critical that you include --menuconfig. Once menuconfig comes up, do the following:
Failure to follow the above steps will result in not being able to boot your system later, especially if you use UEFI.
This will take a LONG time no matter how fancy your rig is. Go do something else and come back in a couple to a few hours. Subsequent runs will not take as long if you ever make minor changes, but this first run will make you wait. When it's done, check the contents of the boot dir to make sure the kernel image has been installed to it.
> ls /boot
You should see something similar to this:
initramfs-genkernel-x86_64-4.6.2-rt-rt5 kernel-genkernel-x86_64-4.6.2-rt-rt5 System.map-genkernel-x86_64-4.6.2-rt-rt5