PROBLEM:  (QAR 65926, QAR 63194)    (Patch ID: OSF435-198)
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This patch fixes a problem with pyxis systems. These systems generate extra
interrupts when PCI interrupts are processed. The following systems are
pyxis systems:
        AlphaPC 164 LX
        AlphaPC 164 SX
        Digital Personal Workstation 433au w/Cypress PCI-ISA Bridge
        Digital Personal Workstation 500au w/Cypress PCI-ISA Bridge
        Digital Personal Workstation 600au w/Cypress PCI-ISA Bridge
        Digital Personal Workstation 433au
        Digital Personal Workstation 500au
        Digital Personal Workstation 600au