-#
-# Update grub2 config
-#
-grub-mkconfig > /boot/grub/grub.cfg
-
-# request a reboot if pae is supported
-if [ ! "$(grep "^flags.* pae " /proc/cpuinfo)" == "" ]; then
- touch /var/run/need_reboot
+if [ -e /boot/grub/grub.cfg ]; then
+ #
+ # Update grub2 config
+ #
+ grub-mkconfig > /boot/grub/grub.cfg
+else
+ #
+ # xen pv with pygrub need grub.conf / menu.lst
+ #
+ echo "timeout 10" > /boot/grub/grub.conf
+ echo "default 0" >> /boot/grub/grub.conf
+ echo "title IPFire (pae-kernel)" >> /boot/grub/grub.conf
+ echo " root (hd0)" >> /boot/grub/grub.conf
+ echo " kernel /vmlinuz-$KVER-ipfire-pae root=/dev/$ROOT rootdelay=10 panic=10 console=hvc0" \
+ >> /boot/grub/grub.conf
+ echo " initrd /initramfs-$KVER-ipfire-pae.img" >> /boot/grub/grub.conf
+ echo "# savedefault 0" >> /boot/grub/grub.conf
+ ln -s grub.conf $MNThdd/boot/grub/menu.lst