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B12.1.5 Multifunction Devices - FAQs
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See http://www.microsoft.com/winlogo/hardware/MF/.
B12.1.5.2 Resource requirements for MFD [Logo Program Clarification]
The PC 99 exception for multifunction PCI devices that use only a single set of relocatable resources refers solely to multifunction devices of the same device class. If different functions within a multiple-function device require separate class drivers—for example, a combination PCI network adapter and modem—then each function must provide a unique PCI SID and SVID that will allow the proper driver to be loaded for each separate function.
Multifunction devices that contain functions from separate classes will not be properly recognized during an operating system upgrade—and therefore drivers will not be properly upgraded—unless unique IDs are provided for each device.
Note that a "supervisory" driver that loads different drivers for the individual functions does not work well with Windows. In particular, driver support is likely to be lost in cases of operating system re-installation or upgrade, or with distribution of new drivers via Windows Update. Therefore, these supervisory drivers should be avoided. The Logo Program requires separate drivers for separate functions.
FAQ Date: May 28, 1999
B12.1.5.3 Exceptions to individual ID requirement for MF devices [Logo Program Clarification] -
Multiple devices of the same device class, such as a multiline serial device.
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Dependent video devices, such as a graphics accelerator on a video card.
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Devices that are generated by an accelerator or auxiliary processor and that do not have independent hardware I/O. That processor must have an ID; under Windows XP/Windows 2000, Mf.sys must be used to enumerate the dependent devices.
FAQ Date: May 28, 1999
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