Simple Firmware Interface
Simple Firmware Interface (SFI) is developed by Intel Corporation as a lightweight method for firmware to export static tables to the operating system. It is supported by Intel's hand-held Moorestown platform.
| Offset | Length | Field |
|---|---|---|
| 0 | 4 | Signature |
| 4 | 4 | Length |
| 8 | 1 | Revision (always 1) |
| 9 | 1 | Checksum |
| 10 | 6 | OEM ID |
| 16 | 8 | OEM Table ID |
| 24 | var. | Table Payload |
SFI tables are data structures in memory, and all SFI tables share a common table header format. The operating system finds the system table by searching 16 byte boundaries between physical address 0x000E0000 and 0x000FFFFF. SFI has CPU, APIC, Memory Map, Idle, Frequency, M-Timer, M-RTC, OEMx, Wake Vector, I²C Device, and a SPI Device table.
SFI provides access to a standard ACPI XSDT (Extended System Description Table). XSDT is used by SFI to prevent namespace collision between SPI and ACPI. It can access standard ACPI tables such as PCI Memory Configuration Table (MCFG).
SFI support was merged into Linux kernel 2.6.32-rc1;[1] the core SFI patch is about 1,000 lines of code. Linux is the first operating system with an SFI implementation.
References
- "Upstream Linux Kernel Support". June 2009.
External links
- Official website
- Brown, Len; Kamp, Kerry Vander (2010-10-19). "Simple Firmware Interface - Draft 0.8.2" (PDF).
- Brown, A. Leonard (2009). "The Simple Firmware Interface" (PDF). Ottawa Linux Symposium 2009.