![]() This sample (no longer supported) is a functional Secure Digital (SD) IO driver. For a description of these function request types, see SD_REQUEST_FUNCTION. SD device drivers can manage the host controller's common register set and the state of the device by calling SdBusSubmitRequest with function requests of type SDRF_GET_PROPERTY and SDRF_SET_PROPERTY. SD I/O commands that specify a function number of a different device stack. SD I/O commands that specify function zero but are outside the range of the address specified in the function basic register (FBR). SD commands that change the device state, such as SELECT_CARD. To ensure this independence, the bus driver rejects the following operations: The driver stacks for the various card functions on a multifunction card must operate independently of one another. Restrictions on SD Card DriversĬertain restrictions apply to Secure Digital (SD) card device drivers that manage a function on an SD combo or multifunction card. ![]() Restrictions on SD Card Drivers SD Card Hardware Identifiersįor information about Secure Digital (SD) device identification strings, see Identifiers for Secure Digital (SD) Devices. Managing SD Cards in User-Mode Applications Secure Digital Requests That Use Extended I/O Secure Digital Requests That Use Direct I/O Opening, Initializing and Closing an SD Card Bus Interface
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