Fallback boot allows Versal ACAP to automatically boot a different PDI than the initial PDI on the same primary boot device if the first PDI fails to boot. If an error occurs during booting the PDI load, the PLM increments the MultiBoot register by 1 and resets the device so that the BootROM can find the next good image.
MultiBoot allows the software developer to specify a different PDI than the initial PDI on the same primary boot device to use for the next Versal ACAP boot process.
To use fallback boot or MultiBoot, store multiple PDIs in the same primary boot device within the search limit for the device. For information, see the Primary Boot Devices table in Boot Device Modes.