Difference between revisions of "EMMC"
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| − | === | + | ===How to check emmc lifespan (supported above kernel 4.x)=== |
| + | <syntaxhighlight lang="text"> | ||
| + | cat /sys/class/mmc_host/mmc0/mmc0\:0001/pre_eol_info | ||
| + | cat /sys/class/mmc_host/mmc0/mmc0\:0001/life_time | ||
| + | </syntaxhighlight> | ||
| + | Devices with different node names may be different。 | ||
| + | |||
| + | ===Description=== | ||
| + | <syntaxhighlight lang="text"> | ||
| + | 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. | ||
| + | </syntaxhighlight><br> | ||
| + | [[File:Emmc-lifetime.jpg|frameless|500px]]<br> | ||
| + | [[File:Emmc-preeolinfo.jpg|frameless|500px]]<br> | ||
Latest revision as of 03:32, 20 May 2022
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.
