board/arch-specific artifacts vs. make clean

Hi,

despite some futile attempts (arch/arm/mach-rmobile/Makefile, board/imgtec/boston/config.mk), CLEAN_FILES cannot be extended outside of the top-level Makefile as clean is in no-dot-config-targets, and the arch and board specific config.mk files are not evaluated then.

How to clean extra files that a board or an arch defines? Add them all to the top-level Makefile?

Jan