During Starfire installations, hpost fails during pc/cic_reg phase if a system 
board does not have an I/O mezzanine card installed. See BugID #4038268 for more
information.  Below is a sample of the failure:

---
phase pc/cic_reg: PC and CIC register tests...
Check compare fail on XDB 5.2 CSR1 mode   Expected 1   Read 3
           0   Clear Ecc Err        Errctl[0]      While 1
           0   Clear NR Err         Errctl[1]      While 1
           0   Mask ecc_err_out     Errctl[2]
           0   Mask nr_err_out      Errctl[3]
           0   Disable data_lo      Errctl[4]
           0   Disable data_hi      Errctl[5]
           0   Reset                Errctl[6]
           0   Freeze               Errctl[7]
           0   Clear Bootbus Err    Errctl[8]      While 1
           0   Mask Bootbus Err     Errctl[9]
           3   Mode[1:0]            Errctl[11:10]  IO144
           0   Disable PLL Err      Errctl[12]
FAIL IOM 5: XDB 5.2 - Mode wrong.
---

This failure mode loops forever unless manually stopped with Ctl-C.

For each system board which does not contain an I/O mezzanine card,
blacklist either the xdb or pc associated with I/O.

Example with no i/o on sb's 3 and 7:

blacklist
---------
xdb 3.2 7.2     # No i/o mezzanine - BugID #4038268

-or-

pc 3.2 7.2      # No i/o mezzanine - BugID #4038268