2-22 Setup and OperationPlug and Play boards are dynamic in nature — the system allocates resources to theseboards upon system boot (Table Section 2-11). Some device drivers support this dynamicboard configuration, but some do not.Device drivers that do not support the dynamic board configuration are also known asstatic device drivers. If using a static device driver, you need to permanently associateresources assigned with a Plug and Play board, instead of relying on the Plug and Playdefault. Otherwise, the device driver might not be able to find the board the next time thesystem boots.Table Section 2-11 Plug and Play ParametersParameter Options DescriptionPlug and Play O/S YesNo (default)Selects the Plug and Play feature whichautomatically assigns the address and interrupt foradded options. Functions only for Plug and Playoperating systems.PCI Device ParametersSelect the PCI Devices parameter if you need to allocate I/O resources (see Table Section2-12). The combed I/O resource allocation parameter default setting is disabled. Theparameter should be enabled only when a non-plug and play board is not working due toI/O space resource conflicts. This is particuliarly true for older boards using 10-bit I/Ospace decoders rather than the full 16-bit I/O space.Use the legend keys to make your selections and exit to the main menu.Table Section 2-12 PCI Device ParametersParameter Options DescriptionCombed I/OResource AllocationEnableDisableIf Enabled, PCI devices requesting I/Oresources are checked: for requests lessthan or equal to 256 bytes, that actual I/Oresources are allocated in the first 256bytes of a 1 KB block of I/O addresses,and that all PCI to PCI bridges (PPB) havetheir ISA Enable bits set.Note that the BIOS enables Combed I/OResource Allocation if it finds aconfigurable PCI VGA downstream of aPPB.
