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Xen only sees 512MB of System RAM. Should be 8GB. (UEFI boot)

I am booting Xen 4.0 from Debian Squeeze, kernel 2.6.32-5-xen-amd64. "xm dmesg" on dom0 shows: Xen-e801 RAM map: 0000000000000000 - 0000000000091400 (usable) 0000000000100000 - 0000000020000000 ...