On the PA-RISC platform, the boot loader is called palo. First merge this bootloader to the system:
emerge --ask sys-boot/palo
The configuration file will be found at /etc/palo.conf. Below is a sample configuration:
--commandline=2/kernel-3.16.5-gentoo root=/dev/sda4 --recoverykernel=/vmlinux.old --init-partitioned=/dev/sda
The first line tells palo the location of the kernel and which boot parameters it must use. The string
2/kernel-3.16.5-gentoo means the kernel named /kernel-3.16.5-gentoo resides on the second partition. Beware, the path to the kernel is relative to the boot partition, not to the root partition.
The second line indicates which recovery kernel to use. If it is the first install and there is no recovery kernel (yet), please comment this out. The third line indicates on which disk palo will reside.
When configuration is done, simply run the palo command: