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[Xen-users] set Domain-0 default memory allocation

hi folks,
anyone around who knows how to setup grub2 to allow at boot time a static memory allocation for the Domain-0. I use debain squeeze, lates update's and my actual grub2 config doesn't work automaticlly at boot time. i configured the arg "dom0_mem=4096M" in the grub.cfg section multiboot as shown bellow:
menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-xen-amd64 and XEN 4.0-amd64' --class debian --class gnu-linux --class gnu --class os --class xen {
        insmod raid
        insmod mdraid
        insmod part_msdos
        insmod part_msdos
        insmod ext2
        set root='(md1)'
        search --no-floppy --fs-uuid --set 577b749a-2133-4fd7-8c11-cd6bdbe54077
        echo    'Loading Linux 2.6.32-5-xen-amd64 ...'
        multiboot       /boot/xen-4.0-amd64.gz placeholder iommu=off dom0_mem=4096M
        module  /boot/vmlinuz-2.6.32-5-xen-amd64 placeholder root=UUID=577b749a-2133-4fd7-8c11-cd6bdbe54077 ro  quiet
        echo    'Loading initial ramdisk ...'
        module  /boot/initrd.img-2.6.32-5-xen-amd64
thanks a lot :-) 
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