How do I add PC BSD / FreeBSD to Grub 2 boot loader?

Question

I have Ubuntu 10.04 installed as my primary operating system, and I installed PC BSD in a different partition: /dev/sda4 without installing it's boot loader. I figured out that I need to edit /etc/grub.d/40_custom to add an entry for PC-BSD. So far, nothing seems to work, though.

EDIT: this sort of works, but doesn't fully boot the OS, it then asks me for the MOUNTROOT partition.

menuentry "PC-BSD 8.1" {
    insmod ufs2
    set root=(hd0,4)
    kfreebsd /boot/kernel/kernel
}

The selected answer below is correct. If you are dual-booting with Linux I suggest NOT installing the PC-BSD bootloader as the documentation suggests, unless you enjoy pain.

Solution

this is what I have in /etc/grub.d/40_custom. Works for me :) Just remember to subsitude hd0,3 with your correct entry

menuentry 'FreeBSD 8.0 64bit' --class os {
    set root='(hd0,3)'
    chainloader +1
}

Comments

[nWorx]

I think that for this to work you need to have the PC-BSD boot loader installed into the PC-BSD partition boot blocks. I sounds like postfuturist does not have the PC-BSD boot loader installed anywhere. If the PC-BSD boot loader can live in the PC-BSD partition boot blocks installing it there will probably get postfuturist up and running.

[postfuturist]

In the graphical installer there is a button at the bottom of the disk selection screen titled "Install PC-BSD boot loader": wiki.pcbsd.org/index.php/… . Does this just install the boot loader on the partition, or the MBR of the disk?

[phunehehe]

@postfuturist: I don't know, but you can try installing it and restore grub if it is installed on the MBR. Here is the guide for restoring grub wiki.ubuntu.com/Grub2#Recover%20Grub%202%20via%20LiveCD