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By default U-Boot builds a default environment from its own configuration and a board-specific set of variables. However it also allows to bypass this entirely and define the entire default environment from a text file. Expose this feature to Buildroot. This allows to have a file e.g. in board/.../uboot.env which contains an easy to maintain text file with the wanted default environment, without patching the U-Boot source code. Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com> Signed-off-by: Arnout Vandecappelle <arnout@mind.be>