Appendix D: UEFI BIOS Recovery
133
Appendix D
UEFI BIOS Recovery Instructions
Warning:
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 arising 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.
D.1 An Overview to the UEFI BIOS
The Unified Extensible Firmware Interface (UEFI) 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 the
system. The UEFI offers a clean, hands-off control to a computer system at bootup.
D.2 How to Recover the UEFI BIOS Image (-the Main BIOS
Block)
A UEFI BIOS flash chip consists of a recovery BIOS block 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 it 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 below for BIOS recovery.
D.3 To Recover the Main BIOS Block Using a USB-Attached
Device
This feature allows the user to recover a BIOS image using a USB-attached device without
additional utilities used. A USB flash device, such as a USB flash drive or a USB CD/DVD
ROM/RW device, can be used for this purpose. However, a USB hard disk drive cannot be
used for BIOS recovery at this time.
