Firmware File System

The UEFI Firmware File System is used to describe the layout of data inside a UEFI firmware image.

The magic number (actually a GUID) " " is located 16 bytes into the file system image; the first 16 bytes are reserved for startup code.

Links

 * UEFITool can read and modify FFS images embedded in UEFI firmware.
 * FFSv0.9 specification