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This option removes everything in the build tree but coreboot.rom, config.build, config.h and make.log - a useful subset of the tree for further testing. Change-Id: I27e559d8d7dc90d8fe5c4ed8e25249e202e5da36 Signed-off-by: Patrick Georgi <pgeorgi@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/35136 Reviewed-by: Angel Pons <th3fanbus@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>