Issue net booting FreeBSD 9.x under Xen?

Hi, We've a small setup with a number of XenServer (6.2) machines - and a PXE boot environment. Real hardware boots fine off the network (the machine we use to boot from is a FreeBSD box itself), as does a VMware guest - but a Xen VM won't boot. Booting 9.2-amd64, it gets as far as: " PXE

Current problem reports assigned to freebsd-xen@FreeBSD.org

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