Upgrading BIOS at run time is implemented by using two Serial Peripheral Interface (SPI) flash devices.
One SPI device provides the active BIOS image, while the other flash device holds backup BIOS image.
When the upgrade is initiated, new BIOS image is copied to the backup flash device. This ensures that the current BIOS image remains untouched. The recently updated flash device is marked as “Active” device. The flash device holding original BIOS becomes “backup” device.
At the time of system reboot, the new BIOS is used for booting as it is marked as “Active” device.\
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This functionality is implemented and controlled by BMC.