In PCI-X, in order to generate split completion to configuration read, the completer
need to know its bus number and device number (for the split completion attribute phase).
Those values are known to the completer only after the first configuration write transaction.
Does it implies that the PCI-X BIOS would not send configuration read transaction to
a device before sending a configuration write to it to set its bus and device numbers?
Mellanox Technologies Ltd.