FW82371EB Intel, FW82371EB Datasheet - Page 40

• Manufacturer Part Number: FW82371EB
• Manufacturer: Intel

Specifications of FW82371EB

• Lead Free Status / RoHS Status: Not Compliant

Intel
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Serial IRQ Enable Clarification
®
82371EB (PIIX4E)
To address the Virtual Wire Mode through the IO APIC problem, configure Virtual Wire mode to
operate through the processor’s local APIC, vs. the IO APIC, and also for level triggered mode via
EXTInt (default).
A workaround for OS/2 has been identified for the anomaly. The OS/2 driver uses an environment
variable switch to force the change to the correct virtual wire mode. The variable in config.sys is:
If this problem is experienced in uni-processor or PIC mode, circuitry to catch the short de-assertion
pulse from the PiiX4E and stretch it to greater than 2 BCLKs for input to the CPU can be employed.
Section 4.1.11 describes the SERIRQC-Serial IRQ Control Register. Bit-7 (Serial IRQ Enable) must be
set only after the SERIRQ/GPI7 Signal Pin Select (Function 0 GENCFG) has been set.
Locate PSD=OS2APIC.PSD statement and add “ /PREC=LID” to the end of it.
Your config.sys PSD statement should read as follows: PSD=OS2APIC.PSD /PREC=LID
Specification Update
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