This issue is fixed in System Software 1.2.1.
An issue in the way the system BIOS identifies PCIe slots in Sun Server X4-4 System Software 1.2, might cause other applications (such as the Oracle ZFS Storage Appliance browser or CLI interface for the ZS4-4) to list PCIe slot information incorrectly.
If you have installed Sun Server X4-4 System Software 1.2 and encounter this issue, upgrade to a later release. You can use Oracle ILOM to view information about installed firmware and BIOS versions.