You will need to install GRUB in the MBR of
/dev/hda (the winXP HDD). So in Linux, login as root and type:
Code:
/sbin/grub-install /dev/hda
Now, you will need to make some modification to
/boot/grub/grub.conf (the GRUB configuration file).
You should have an entry for windowsXP.
Code:
title WindowsXP
rootnoverify (hd0,0)
chainloader +1