UEFI simple I/O protocol

Article
03/23/2023

Important

Some information in this section may apply only to Windows 10 Mobile and certain processor architectures.

The simple I/O protocol is used by flashing tools to enable communication between the device and a host computer in the pre-boot environment.

Information about flashing tools will be provided in a future release of this documentation.

EFI_SIMPLE_WINPHONE_IO_PROTOCOL

This section provides a detailed description of EFI_SIMPLE_WINPHONE_IO_PROTOCOL. This protocol enables simple communication between host and device in a pre-boot environment.

GUID

// {BDE900DD-190A-4c7d-9663-16BA8ED88B55}
#define EFI_SIMPLE_WINPHONE_IO_PROTOCOL_GUID \
  { 0xbde900dd, 0x190a, 0x4c7d, 0x96, 0x63, 0x16, 0xba, 0x8e, \
   0xd8, 0x8b, 0x55 };

Revision number

#define EFI_SIMPLE_WINPHONE_IO_PROTOCOL_REVISION   0x00010001

Protocol interface structure

typedef struct _EFI_SIMPLE_WINPHONE_IO_PROTOCOL {
  UINT32                                        Revision;
  EFI_SIMPLE_WINPHONE_IO_INITIALIZE             Initialize;
  EFI_SIMPLE_WINPHONE_IO_READ                   Read;
  VOID*                                         Reserved;
  EFI_SIMPLE_WINPHONE_IO_WRITE                  Write;
  EFI_SIMPLE_WINPHONE_IO_GET_MAXPACKET_SIZE     GetMaxPacketSize;
} EFI_SIMPLE_WINPHONE_IO_PROTOCOL;

Members

Revision
The revision to which the EFI_SIMPLE_WINPHONE_IO_PROTOCOL adheres. All future revisions must be backward compatible. If a future version is not backward compatible, a different GUID must be used.

Initialize
This function waits for a connection from the host computer. See EFI_SIMPLE_WINPHONE_IO_PROTOCOL.Initialize.

Read
Receives a buffer of bytes from the host computer. See EFI_SIMPLE_WINPHONE_IO_PROTOCOL.Read.

Reserved Reserved for future use.

Write
Sends a buffer of bytes to the host computer. See EFI_SIMPLE_WINPHONE_IO_PROTOCOL.Write.

GetMaxPacketSize
Returns the maximum packet size supported by this protocol. See EFI_SIMPLE_WINPHONE_IO_PROTOCOL.GetMaxPacketSize.

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