Xen devel - May 2009 - can''t allocate low memory for domain

Hi friends,
                 when I tried allocating machine addresses (memory behind a PCI
device) for
domU guests by tweaking the /xen/common/memory.c file, I get the following
error,

Error: (4, ''Out of memory'', "xc_dom_boot_mem_init:
can''t allocate low memory for domain\n")

can someone explain me why this is happening and what should do to successfully
boot a domU
guest from the memory behind the PCI device?

Thanks,
Dinesh C

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