EMMC flash storage wear level
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eMMC Health Status
The following commands are used to get the estimated wear level of the eMMC flash storage chip used in Wiren Board 5 controllers:
Mount debugfs
mount -t debugfs none /sys/kernel/debug/
Read the wear level estimation
cat /sys/kernel/debug/mmc0/mmc0\:0001/ext_csd \
| python -c 'import binascii, sys; print "~%d%% wear" % (ord(binascii.unhexlify(sys.stdin.read().strip())[0x5e])*10)'
Example output:
~10% wear
The level is returned in multiplies of 10 percent. The minimum wear is 0% (new device), the maximum is supposed to be 100%.