Only certain PCIe cards can be used as direct I/O endpoint devices on an I/O domain. You can still use other cards in your Oracle VM Server for SPARC environment, but they cannot be used with the Direct I/O feature. Instead, you can use these cards for service domains and for I/O domains that have entire root complexes assigned to them.
For the most up-to-date list of supported PCIe cards, refer to:
https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&doctype=REFERENCE&id=1325454.1