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There aren’t any official documents to flash the cache on Galileo, however I found a couple of links you might find useful. Take a look at https://github.com/slavaim/Linux-Intel-Galileo-Gen2-QuarkX1000/blob/master/BSPv1.1.0/linux_v3.8.7/work/arch/mn10300/mm/cache-flush-icache.c and https://github.com/slavaim/Linux-Intel-Galileo-Gen2-QuarkX1000/blob/master/BSPv1.1.0/linux_v3.8.7/work/arch/mn10300/mm/cache-smp-flush.c .
I’ve never tried to do this, but hopefully these links will point you in the right direction.
Let us know your results.