smartctl 无法使用，需要用 mmc 命令。mmc extcsd read /dev/mmcblk
eMMC Life Time Estimation A [EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A]: 0x02
eMMC Life Time Estimation B [EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B]: 0x02
eMMC Pre EOL information [EXT_CSD_PRE_EOL_INFO]: 0x01
Life Time Estimation 的 0x02 代表已使用了 1020% 的寿命。如果是 10% 的寿命。0x01，则代表已使用了 0
Pre EOL information 含义:
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