ok do this:
first u have to know what drive your partition is on. example /dev/hda or /dev/sda etc..
then call it with fdisk
[cmd=]fdisk /dev/sda[/cmd]
then the partition u want to convert chose p to list the partition and if its partition 5 xample the type t
then it will ask for partition number enter 5
then it will ask to chose a partition type enter a5
then if that partition was on same drive as your debian partition it wont be able to write the changes right away. to write changes just chose w i think it is. then reboot if needed.
once back download the iso of 8.0-RC1 memstick and dd it to new partition. example if your partition was /dev/sda5 you will type
[cmd=]dd if=/home/joeblow/8.0-RC1-i386-memstick.img of=/dev/sda5[/cmd]
that will it a nutshell make your freebsd partition the same as the content of that iso. then u need to configure grub to boot on that.
So what you do is enter this in your grub config
ass this to /boot/grub/menu.1st
Code:
title FreeBSD
root (hd0,4)
chainloader +1
this is always assuming your partition was sda5
remember in linux partition are counted from 1 but grub will count from 0
so /dev/sda3 = hd0,2
/dev/sdc6 = hd2,5
and so on.
Then reboot and you should chose freebsd from grub menu and if all went well you should be soon in the freebsd installer.
Keep us posted