BARs must be disabled when using Root Port

Description

You will see this message if you have enabled Base Address Registers (BARs) for the Avalon Memory-Mapped (Avalon-MM) of the Altera® Hard IP core for PCI Express® with Port type set to Native Endpoint, but then switch to Port type Root Port.

For example:

1)  Enable BAR0 (32-bit non prefetchable)
2)  Enable BAR1 (32-bit non prefetchable)
3)  Change the Port Type from Native endpoint to Root port

Resolution

To work around this issue:

Re-select the Endpoint type, disable all BARs, then re-select Root Port type.

This behavior is not scheduled to be changed in a future Quartus® II software version.