Intel Extensible Firmware Interface - Manual (Page 773)

Protocols — Device I/O Protocol
Version 1.10 12/01/02 18-13
DEVICE_IO.Flush()
Summary
Flushes any posted write data to the device.
Prototype
typedef
EFI_STATUS
(EFIAPI *EFI_IO_FLUSH) (
IN EFI_DEVICE_IO_INTERFACE *This
);
Parameters
This A pointer to the EFI_DEVICE_IO_INTERFACE instance. Type
EFI_DEVICE_IO_INTERFACE is defined in Section 18.2.
Description
The Flush() function flushes any posted write data to the device.
Status Codes Returned
EFI_SUCCESS The buffers were flushed.
EFI_DEVICE_ERROR The buffers were not flushed due to a hardware error.