The Simple Firmware Interface (SFI) is a method for platform firmware to export static tables to the operating system (OS).
The latest version of the SFI specification is published on this web site.
SFI Specification Revision 0.8.2 is available. 0.8.2 adds a bit to the DEVS table for SD devices, and deletes the un-used IDLE table.
Initial SFI support shipped Linux Kernel 2.6.32.