apt-get install bcache-tools wipefs /dev/mmcblk1 wipefs -a /dev/mmcblk1 wipefs /dev/sdc wipefs -a /dev/sdc
make-bcache -B /dev/sdc -C /dev/mmcblk1 bcache-super-show /dev/mmcblk1
root@aac:~# bcache-super-show /dev/mmcblk1 sb.magic ok sb.first_sector 8 [match] sb.csum ADD0A846D489C6D0 [match] sb.version 0 [cache device] dev.label (empty) dev.uuid f33fe947-d4bc-43b3-9fe2-c6b45b791f0b dev.sectors_per_block 1 dev.sectors_per_bucket 1024 dev.cache.first_sector 1024 dev.cache.cache_sectors 122141696 dev.cache.total_sectors 122142720 dev.cache.ordered no dev.cache.discard no dev.cache.pos 0 dev.cache.replacement 0 [lru] cset.uuid 4db271ee-b057-4ae7-a727-a7f90dc700d7
echo "4db271ee-b057-4ae7-a727-a7f90dc700d7" > /sys/block/bcache0/bcache/attach