Anilrgowda

This guide shows you how you could use the Darwin bootloader of OS X as the boot manager.

Assumption: partition 1 = OS X, partition 2 = Vista

Step 1: install OS X on partition 1.

Step 2: make partition 2 the active partition so that Vista can be installed on it.
Boot up OS X and in a terminal window,
sudo fdisk -e /dev/rdisk0
flag 2
quit
reboot

Step 3: install Vista on partition 2.

Step 4: restore OS X on the MBR.
Boot off OS X dvd disc in single user mode (press F8 & type -s). At single user prompt,
fdisk -e /dev/rdisk0
flag 1
update
write
quit
reboot

Step 5: make partition 2 the active partition now to boot up Vista.
At this point OS X should boot up and in a terminal window,
sudo fdisk -e /dev/rdisk0
flag 2
quit
reboot

Step 6: restore Vista on the MBR.
Upon reboot, Vista will show "\Window\system32\winload" corrupted.
Insert Vista disc & follow directions to recover.
Reboot & check that Vista boots up fine.

Step 7: make partition 1 the active partition again to use the Darwin bootloader.
Boot off OS X dvd disc in single user mode again (press F8 & type -s). At single user prompt,
fdisk -e /dev/rdisk0
flag 1
quit
reboot

Voila!

To set the timeout duration of the Darwin bootloader, add the following flag to /Library/Preferences/SystemConfiguration/com.apple.Boot.plist
<key>Timeout</key>
<string>x</string>
where x = number of seconds the bootloader will wait before booting up partition 1.