EMMC

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1 How to check emmc lifespan (supported above kernel 4.x)

   cat /sys/class/mmc_host/mmc0/mmc0\:0001/pre_eol_info
   cat /sys/class/mmc_host/mmc0/mmc0\:0001/life_time

Devices with different node names may be different。

2 Description

   Since e.MMC 5.0, device health status became part of the standard. It provides life time estimation for SLC and MLC areas as well as pre EOL status:
    Device life time estimation type A: life time estimation for SLC eraseblocks, provided in steps of 10%, e.g.:
        0x02 means 10%-20% device life time used.
    Device life time estimation type B: life time estimation for MLC eraseblocks, provided in steps of 10%, e.g.:
        0x02 means 10%-20% device life time used.
    Pre EOL information: overall status for reserved blocks. Possible values are:
        0x00 - Not defined.
        0x01 - Normal: consumed less than 80% of the reserved blocks.
        0x02 - Warning: consumed 80% of the reserved blocks.
        0x03 - Urgent: consumed 90% of the reserved blocks.