Appendix C: UEFI BIOS Recovery
C-1
Appendix C
UEFI BIOS Recovery Instructions
Attention!
Do not upgrade the BIOS unless your system has a
BIOS-related issue. Flashing the wrong BIOS can cause irreparable
damage to the system. In no event shall Supermicro be liable for
direct, indirect, special, incidental, or consequential damages aris-
ing from a BIOS update. If you need to update the BIOS, do not
shut down or reset the system while the BIOS is updating to avoid
possible boot failure.
C-1 An Overview to the UEFI BIOS
The Unified Extensible Firmware Interface (UEFI) specification provides a
software-based interface between the operating system and the platform
firmware in the pre-boot environment. The UEFI specification supports
an architecture-independent mechanism for add-on card initialization to
allow the UEFI OS loader, which is stored in the add-on card, to boot
up the system. UEFI offers a clean, hands-off control to a computer
system at bootup.
C-2 How to Recover the UEFI BIOS Image (-the Main
BIOS Block)
A UEFI BIOS flash chip consists of a recovery BIOS block, comprised
of two boot blocks and a main BIOS block (a main BIOS image). The
boot block contains critical BIOS codes, including memory detection and
recovery codes for the user to flash a new BIOS image if the original
main BIOS image is corrupted. When the system power is on, the boot
block codes execute first. Once that is completed, the main BIOS code
will continue with system initialization and bootup.
Note:
Follow the BIOS Recovery instructions below for BIOS
recovery when the main BIOS boot crashes. However, when the
BIOS boot block crashes, you will need to follow the procedures
in Appendix D.
