Allied Telesis AT-2972T/2 - Manual (Page 116)

Chapter 10: Troubleshooting
116
Solution: This is because some of the older servers are advertising
themselves as PCI-X capable systems. This causes the adapter to
operate in PCI-X mode; therefore; it is not seen by the PCI bus. This
problem can be corrected by configuring the firmware to operate in forced
pci mode. Refer to b57diag for configuration instructions.