PROBLEM: (94944) (PATCH ID: OSF540-222)
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This patch fixes a kernel memory fault for systems that contain more that 8 
IDE/ATA buses.
The problem here is that the Tru64 IDE driver only supports buses ata0 
thru ata7 on a given system. Any IDE/ATA buses are numbered higher than 7 as a 
result of too many IDE/ATA controllers or too many system reconfigurations 
without rebuilding a new hardware management database, can result in a kernel 
memory fault.


PROBLEM: (81454, 93085) (PATCH ID: OSF540-254)
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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.


PROBLEM: (94368) (PATCH ID: OSF540-394)
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This patch prevents an IDE bus hang caused when issuing a play audio track 
command from scu to an ATAPI CDROM containing an enhanced CD.
An enhanced CD is a multisession disc with the first session containing audio 
tracks and a second session containing data tracks.  Some ATAPI CDROMs do not 
correctly report an error to the Tru64 IDE/ATAPI driver when a play audio 
command is issued on the data portion of these discs.  This can lead to an 
IDE bus hang, requiring a power cycle on the system.


PROBLEM: (94012) (PATCH ID: OSF540-382)
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This patch fixes the Tru64 IDE/ATAPI driver's reset logic to prevent 
a kernel memory fault when booting and to properly detect and log all 
master and slave reset failures when the system is operational.
First, during probing of the IDE bus by the Tru64 IDE/ATAPI driver some 3rd 
party ATAPI CDROMs respond as if they are both a master and a slave on the IDE 
bus when no slave is physically present on the bus. When this occurs during 
probing, the Tru64 IDE/ATAPI driver believes there are two devices on the bus 
and not one device responding as two. This leads to a kernel memory fault 
later in the boot process when the driver attempts to configure the missing
slave device. 

Secondly, the Tru64 IDE/ATAPI driver does not properly detect or log all 
master or slave reset failures. A reset failure is caused by a drive's 
inability to pass its own device diagnostics, which is a good indication of 
a hardware problem in the device.