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.
Initial SFI support shipped Linux Kernel 2.6.32.
SFI Specification Revision 0.8 is available. The DEVS table replaces the I2CB and SPIB tables. The GPIO table has been added.