PCIe "Enumeration" SW on NIOS II ?

Are you sure your setup will work? The Stratix IV Development board does not generate a 100MHz PCI output clock via its edge connector.

Can you create a PCIe RootPort without a 100MHz source? Or have you hacked the board to support it?

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I have the Stratix IV dev. board, configured as RooPort, plugged into a chassis with a number of other PCIe boards

with a PLX PCIe switch

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Are you sure the slot you have plugged the PCIe board into can be operated as a RootPort. I suspect its really just a slave port.

U-Boot will have PCI enumeration source. Try building U-Boot for NIOS II. Linux also has enumeration support, so you could try NIOS II uCLinux or Linux.

Cheers,

Dave