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This doesn't work at present, merely printing an error when U-Boot is selected as a payload. This is because it adds a file into the U-Boot tree which makes U-Boot's build system think that the tree is unclean. Update the rules to put the tag file outside the source tree. Use an out-of-tree build for U-Boot to avoid changing the source tree. Signed-off-by: Simon Glass <sjg@chromium.org> Change-Id: I24d6545b54f97afeefaca3ffed79eec2e7afacb4 Reviewed-on: https://review.coreboot.org/c/coreboot/+/59600 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>