mmcinfo

Help:
=> help mmcinfo
 mmcinfo - display MMC info

Usage:
mmcinfo - display info of the current MMC device 
 =>

=> mmcinfo

curr_device:0
Device: SUNXI SD/MMC
Manufacturer ID: 0
OEM: 0
Name: SDU1
Bus Speed: 50000000
Mode : SD High Speed (50MHz)
Rd Block Len: 512
SD version 3.0
High Capacity: Yes
Capacity: 29.8 GiB
Bus Width: 4-bit
Erase Group Size: 512 Bytes

Дополнение

Для ТВ-бокса:

=> mmcinfo
curr_device:2
Device: SUNXI SD/MMC
Manufacturer ID: 15
OEM: 100
Name: QE66M
Bus Speed: 50000000
Mode : MMC legacy
Rd Block Len: 512
MMC version 5.1
High Capacity: Yes
Capacity: 14.7 GiB
Bus Width: 8-bit
Erase Group Size: 512 KiB
HC WP Group Size: 8 MiB
User Capacity: 14.7 GiB WRREL
Boot Capacity: 4 MiB ENH
RPMB Capacity: 16 MiB ENH