PROBLEM:  (73882, 75254, 75227) (PATCH ID: OSF440-315)
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This patch fixes the following problems:
    - Processes may hang due to waiting for I/O interrupts.  This
      was seen when running some AdvFS stress applications.

    - The SCU command "set pages pcf" will hang a system
      when ATAPI CDrom device is selected. The system will
      stay in a hung state until a timeout occurs at which time the
      device cannot be accessed  until after a hard reset.
PROBLEM: (75340, 77361, 77425, 79767) (PATCH ID: OSF440-468)
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This patch corrects the following problems with some models of IDE CD-ROM
and removable disk devices during system startup:
     - Some IDE CD-ROMs may cause a system panic, with  "kernel memory fault"
       during a bus device reset.

    - Some IDE master devices require special code when they are
      configured as the IDE master with a non-existant slave device.
      This could cause a
      "xpt_callback_thread: callback queue corrupted" panic.

    - Playing the last audio track of an enhanced CD may cause
      unpredictable system slow-downs or temporary system hangs.