HP Workstation x2000 hp workstation x2000 - Technical Reference and Troublesho - Page 95
Virtual wire mode, Symmetric I/O mode, PCI IRQ Lines
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NOTE HP BIOS BIOS Addresses • Virtual wire mode: This mode, which is implemented using the 82C59 interrupt and the I/O APIC controller, is used during boot time. The virtual wire mode allows the transition to the symmetric I/O mode. In the virtual wire mode, only one processor executes operations. • Symmetric I/O mode: This mode is implemented using the I/O APIC controller and allows for multiple processor operations. In PIC mode and virtual wire mode, PCI interrupts are routed to the INT line. In symmetric I/O mode, PCI interrupts are routed to the I/O APIC controllers and forwarded over an APIC bus to the processors. PCI IRQ Lines PCI devices generate IRQs using up to four PCI IRQ lines (INTA#, INTB#, INTC#, and INTD#). PCI interrupts can be shared; several devices can use the same interrupt. However, optimal system performance is reached when minimizing the sharing of interrupts. Refer to page 74 for a table of the PCI device interrupts. Chapter 3 95