- /* Probing PCI using config cycles cause this exception
- * when a device is not present. Catch it and return to
- * the PCI exception handler.
+ /* Probing PCI(E) using config cycles may cause this exception
+ * when a device is not present. To gracefully recover in such
+ * scenarios config read/write routines need to be instrumented in
+ * order to return via fixup handler. For examples refer to
+ * pcie_in_8(), pcie_in_le16() and pcie_in_le32()