Extensible Firmware Interface Specification
188 12/12/00 Version 1.02
Description
The Simple File System protocol provides a minimal interface for file-type access to a device. This
protocol is only supported on some devices.
Devices that support the Simple File System protocol return an EFI_FILE_IO_INTERFACE.
The only function of this interface is to open a handle to the root directory of the file system on the
volume. Once opened, all accesses to the volume are performed through the volume’s file handles,
using the EFI_FILE protocol (see Section 10.2). The volume is closed by closing all the open file
handles.
The firmware automatically creates handles for any block device that supports the following file
system formats:
• FAT12, FAT16, FAT32
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