> Is there a way to produce a signed u-boot-spl image during the build, that > can be used directly on the target without using the EDS? > > If you upgrade to the U-Boot 2016.01 (or maybe even earlier?), mkimage actually supports adding the Bootrom signature to the SPL for you. The current makefile is kind enough to concatenate the U-Boot SPL and its DTS for you, and then run mkpimage to create an 'spl/u-boot-spl-dts.sfp' file [1].
If that doesn't work for you, you might find [2] to be useful. The bootrom "signature" is simple enough to implement in a do_compile_append() or custom task. [1] http://git.denx.de/?p=u-boot.git;a=blob;f=Makefile;h=c9c2cbedc641853c7886ffb023e5798362152899;hb=6905f4d3c7be46fed4859f51f0a8f9a1107c22e7#l1012 [2] https://github.com/maximeh/mkpimage
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