Просто mmc введи
Usage:
mmc info - display info of the current MMC device
mmc read <device num> addr blk# cnt
mmc write <device num> addr blk# cnt
mmc erase <device num> blk# cnt
mmc write.ext4sp <device num> addr blk# cnt
mmc rescan <device num>
mmc part - lists available partition on current mmc device
mmc dev [dev] [part] - show or set current mmc device [partition]
mmc list - lists available devices
mmc hwpartition [args...] - does hardware partitioning
arguments (sizes in 512-byte blocks):
[user [enh start cnt] [wrrel {on|off}]] - sets user data area attributes
[gp1|gp2|gp3|gp4 cnt [enh] [wrrel {on|off}]] - general purpose partition
[check|set|complete] - mode, complete set partitioning completed
WARNING: Partitioning is a write-once setting once it is set to complete.
Power cycling is required to initialize partitions after set to complete.
mmc setdsr <value> - set DSR register value
mmc reg <device num> - display registers of the current MMC device