Appendix B
– BIOS & Setup
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CPU-111-10 - Intel Xeon Quad-Core 6U VPX SBC – User’s Manual
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B.8
PnP Setup Menu
The PnP menu is used to configure Plug-n-Play, a legacy BIOS initiative used to support operating systems such as
Windows95, Windows98, and WindowsNT. ACPI has largely replaced this feature; however, it is necessary for
platforms to support older operating systems.
The PnP menu consists of two sections; basic configuration that enables Plug-n-Play and identifies if a PnP should
perform configuration or let the OS do it; and then, another section that defines which system IRQs should be
reserved for PnP’s use, so that PCI doesn’t use them. The following table presents the fields in the PnP menu.
Plug-n-Play
Enable PnP feature. When disabled, a PnPaware OS will not find any PnP services in
the BIOS, and all other configuration parameters in the menu will be greyed out.
Enable to support legacy OSes like DOS, Windows95, Windows98, and WindowsNT.
Disable for operating systems like WindowsXP or Windows Vista, or for Linux
operating systems with ACPI support.
Plug-n-Play OS
Enable delay of configuration of PnP hardware and option ROMs. When enabled,
BIOS will NOT configure the devices, and instead defer assignment of resources,
such as DMA, I/O, memory, and IRQs, to the PnP OS. When disabled, the BIOS
performs conflict detection and resolution, and assigns resources for the OS. Disable
this parameter when running non-PnP OSes like DOS. Enable this parameter when
running PnP OSes like Windows95, Windows98, and WindowsNT.
IRQ0
Enable exclusive use of IRQ0 by PnP.
IRQ1
Enable exclusive use of IRQ1 by PnP.
IRQ2
Enable exclusive use of IRQ2 by PnP.
IRQ3
Enable exclusive use of IRQ3 by PnP.
IRQ4
Enable exclusive use of IRQ4 by PnP.
IRQ5
Enable exclusive use of IRQ5 by PnP.
IRQ6
Enable exclusive use of IRQ6 by PnP.
IRQ7
Enable exclusive use of IRQ7 by PnP.
IRQ8
Enable exclusive use of IRQ8 by PnP.
IRQ9
Enable exclusive use of IRQ9 by PnP.