boot_os : Set to yes/Yes/true/True/1 to enable booting to OS,
any other value to fall back to U-Boot (including
unset)
+falcon_args_file : Filename to load as the 'args' portion of falcon mode
+ rather than the hard-coded value.
+falcon_image_file : Filename to load as the OS image portion of falcon
+ mode rather than the hard-coded value.
Using spl command
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