A method includes initiating a boot of a system-on-chip coupled to a boot device. The boot is initiated from boot code stored in nonvolatile memory responsive to a power-on-reset. Under control of the boot code: a first register value is loaded into a register; a name string from the boot code is accessed; the first register value is obtained from the register; and the first register value and name string are converted to a first string value, which is provided as a first filename. The boot device is searched for a boot image file with the first filename. If the first filename is not found in the boot device, the first register value is incremented to provide a second register value. The obtaining, converting, and searching are repeated using a second filename generated using the second register value, and a valid filename for the boot image file is iteratively generated.
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