Device at address 0

["Parampalli, Niranjana" <niranjana.parampalli@intel.com>]

I am looking at a PCI implementation which 
requires BaseAddressReg to be non zero value
(does not respond if located at 0). I could not
find anything relevant in PCI (2.3) that precludes
relocating device to Address 0. Any thoughts?

Thanks,
-n.p.