mmc的命令
1：对mmc读操作
mmc read addr blk# cnt
2：对mmc写操作
mmc write addr blk# cnt
3：对mmc擦除操作
mmc erase blk# cnt
4：重新搜索mmc设备
mmc rescan
5：列出mmc的分区
mmc part - lists available partition oncurrent mmc device
=> mmc part #或者使用part list mmc 1
Partition Map for MMC device 1 -- Partition Type: DOS
Part Start Sector Num Sectors UUID Type
1 2048 196608 7ae31079-01 0c Boot
2 198656 7143424 7ae31079-02 83 6：查看当前的设备号，或者设置设备号及分区
mmc dev [dev][part] - show or set currentmmc device [partition]
=> mmc dev
switch to partitions #0, OK
mmc1(part 0) is current device 7：硬件校验
mmc hwpartition [args…] - does hardware partitioning
8：列出当前的mmc设备
mmc list - lists available devices
=> mmc list
OMAP SD/MMC: 0
OMAP SD/MMC: 1 (eMMC) 9: 打印一些当前mmc设备的信息
mmcinfo
“`
=> mmcinfo
Device: OMAP SD/MMC
Manufacturer ID: fe
OEM: 14e
Name: MMC04
Tran Speed: 52000000
Rd Block Len: 512
MMC version 4.4.1
High Capacity: Yes
Capacity: 3.5 GiB
Bus Width: 4-bit
Erase Group Size: 512 KiB
HC WP Group Size: 4 MiB
User Capacity: 3.5 GiB
Boot Capacity: 16 MiB ENH
RPMB Capacity: 128 KiB ENH
read 500 KB/s. error 0/2 (0%)
write ### MB/s. error 0/0 (0%)