获取CID：

cat /sys/block/mmcblk0/device/cid

获取CSD：

cat /sys/block/mmcblk0/device/csd

获取OCR：

cat /sys/block/mmcblk0/device/ocr

获取RCA：

cat /sys/block/mmcblk0/device/rca

获取DSR：

cat /sys/block/mmcblk0/device/dsr

查看eMMC芯片寿命：

sudo mmc extcsd read /dev/mmcblk0 | grep Life

eMMC Life Time Estimation A [EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A]: 0x01

eMMC Life Time Estimation B [EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B]: 0x03

从eMMC5.0开始，支持健康度查询，以记录芯片的读写次数换算为寿命信息。数据越靠近0越好，0x01表示0-10%之间，0x0A表示90%-100%之间，0x0B表示寿命已尽。

# cat /sys/block/mmcblk0/device/*

# mmc help

Usage:

mmc extcsd read

Print extcsd data from .

mmc writeprotect boot get

Print the boot partitions write protect status for .

mmc writeprotect boot set

Set the boot partitions write protect status for .

This sets the eMMC boot partitions to be write-protected until

the next boot.

mmc writeprotect user set

Set the write protect configuration for the specified region

of the user area for .

 must be "none|temp|pwron".

    "none"  - Clear temporary write protection.

    "temp"  - Set temporary write protection.

    "pwron" - Set write protection until the next poweron.

 specifies the first block of the protected area.

 specifies the size of the protected area in blocks.

NOTE! The area must start and end on Write Protect Group

boundries, Use the "writeprotect user get" command to get the

Write Protect Group size.

mmc writeprotect user get

Print the user areas write protect configuration for .

mmc disable 512B emulation

Set the eMMC data sector size to 4KB by disabling emulation on

.

mmc gp create <-y|-n|-c>

Create general purpose partition for the .

Dry-run only unless -y or -c is passed.

Use -c if more partitioning settings are still to come.

NOTE!  This is a one-time programmable (unreversible) change.

To set enhanced attribute to general partition being created set

 to 1 else set it to 0.

To set extended attribute to general partition

 set to 1,2 else set it to 0

mmc enh_area set <-y|-n|-c>

Enable the enhanced user area for the .

Dry-run only unless -y or -c is passed.

Use -c if more partitioning settings are still to come.

NOTE!  This is a one-time programmable (unreversible) change.

mmc write_reliability set <-y|-n|-c>

Enable write reliability per partition for the .

Dry-run only unless -y or -c is passed.

Use -c if more partitioning settings are still to come.

NOTE!  This is a one-time programmable (unreversible) change.

mmc status get

Print the response to STATUS_SEND (CMD13).

mmc bootpart enable

Enable the boot partition for the .

Disable the boot partition for the if is set to 0.

To receive acknowledgment of boot from the card set

to 1, else set it to 0.

mmc bootbus set

Set Boot Bus Conditions.

 must be "single_backward|single_hs|dual"

 must be "x1|retain"

 must be "x1|x4|x8"

mmc bkops enable

Enable the eMMC BKOPS feature on .

NOTE!  This is a one-time programmable (unreversible) change.

mmc hwreset enable

Permanently enable the eMMC H/W Reset feature on .

NOTE!  This is a one-time programmable (unreversible) change.

mmc hwreset disable

Permanently disable the eMMC H/W Reset feature on .

NOTE!  This is a one-time programmable (unreversible) change.

mmc sanitize

Send Sanitize command to the .

This will delete the unmapped memory region of the device.

mmc rpmb write-key

Program authentication key which is 32 bytes length and stored

in the specified file. Also you can specify '-' instead of

key file path to read the key from stdin.

NOTE!  This is a one-time programmable (unreversible) change.

Example:

  $ echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH | \

    mmc rpmb write-key /dev/mmcblk0rpmb -

mmc rpmb read-counter

Counter value for the will be read to stdout.

mmc rpmb read-block