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.


PROBLEM: (81454, 93085) (PATCH ID: OSF440-938)
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This patch fixes an IDE/ATA bus hang caused by attempting to complete raw odd 
byte DMA transfers to/from IDE/ATAPI devices.
The IDE/ATAPI specifications do no permit odd aligned or odd length DMA 
transfers to IDE/ATAPI devices.  However, the IDE driver uses CAM 
scatter-gather lists, which are common to all devices under the CAM 
subsystem, to complete odd and even DMA transfers.  These buffers can be of 
odd length or odd address alignment if an IO request is made for an odd 
amount of data.  The discrepency between the CAM lists used by the IDE driver 
and the IDE/ATAPI specification causes the IDE driver to hang the IDE bus 
when attempting to complete raw odd byte or odd aligned DMA data transfers 
with IDE/ATAPI devices.