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This patch makes use of a new sunxi SPL header format, where
fields for passing data to U-Boot are reserved. This allows the
"fel" utility to provide specific pieces of information by
setting these fields (which will be evaluated by U-Boot then).

For now, we provide the memory location of the boot script file
(boot.scr) this way. A suitably modified U-Boot can adjust the
boot process accordingly and will auto-execute the script.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>
Acked-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>