Parse eMMC Extended CSD and print useful things.

parse-ext-csd.py

#!/usr/bin/env python
"""
Author: Kyle Manna <[email protected]>
Blog: https://blog.kylemanna.com

 cat /d/mmc0/mmc0:0001/ext_csd
 0000000000000001030100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000087a0000000000000000061502030700100608010101080800100000728000000808080808080000000000010200070002000500000000000001000200000000000000000000000000000100050000000000030001ca00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

 """
import binascii
import re
import sys

def str2bytearray(s):
	if len(s) % 2:
		s = '0' + s

	reorder = True
	if reorder:
		r = []
		i = 1
		while i <= len(s):
			r.append(s[len(s) - i - 1])
			r.append(s[len(s) - i])
			i += 2
		s = ''.join(r)

	out = bytearray(binascii.unhexlify(s))

	return out


if __name__ == '__main__':

	ecsd_str = '0000000000000001030100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000087a0000000000000000061502030700100608010101080800100000728000000808080808080000000000010200070002000500000000000001000200000000000000000000000000000100050000000000030001ca00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
	#ecsd_str = '320100'
	ecsd = str2bytearray(ecsd_str)

	line_len = 16
	i = 0
	while i < len(ecsd):
		sys.stdout.write("{0:04x}:\t".format(i))
		for j in range(line_len):
			if (i < len(ecsd)):
				sys.stdout.write("{0:=02x}".format(ecsd[i]))
				i = i + 1
			else:
				break

			if (j == (line_len - 1)): pass
			elif (i % 4): sys.stdout.write(" ")
			else: sys.stdout.write("   ")

		sys.stdout.write("\n")

	print("SECURE_REMOVAL_TYPE[16] = 0x{:x}".format(ecsd[16]))
	print("SLC_DEVICE_HEALTH_STATUS[87] = 0x{:x}".format(ecsd[87]))
	print("SLC_DEVICE_HEALTH_STATUS[87] = 0x{:x}".format(ecsd[87]))
	print("MLC_DEVICE_HEALTH_STATUS[94] = 0x{:x}".format(ecsd[94]))
	print("SEC_BAD_BLK_MGMNT[134] = 0x{:x}".format(ecsd[134]))
	print("RPMB_SIZE_MULT[168] = 0x{:x}".format(ecsd[168]))
	print("FW_CONFIG[169] = 0x{:x}".format(ecsd[169]))
	print("ERASE_GROUP_DEF[175] = 0x{:x}".format(ecsd[175]))
	print("EXT_CSD_REV[192] = 0x{:x}".format(ecsd[192]))
	print("CSD_STRUCTURE[194] = 0x{:x}".format(ecsd[194]))
	print("CARD_TYPE[196] = 0x{:x}".format(ecsd[196]))
	print("ERASE_TIMEOUT_MULT[223] = 0x{:x}".format(ecsd[223]))
	print("HC_ERASE_GRP_SIZE[224] = 0x{:x}".format(ecsd[224]))
	print("BOOT_SIZE_MULT[226] = 0x{:x}".format(ecsd[226]))
	print("BOOT_INFO[228] = 0x{:x}".format(ecsd[228]))
	print("SEC_TRIM_MULT[229] = 0x{:x}".format(ecsd[229]))
	print("SEC_ERASE_MULT[230] = 0x{:x}".format(ecsd[230]))
	print("SEC_FEATURE_SUPPORT[231] = 0x{:x}".format(ecsd[231]))
	print("PRE_EOL_INFO[267] = 0x{:x}".format(ecsd[267]))
	print("DEVICE_LIFE_TIME_EST_TYP_A[268] = 0x{:x}".format(ecsd[268]))
	print("DEVICE_LIFE_TIME_EST_TYP_A[269] = 0x{:x}".format(ecsd[269]))

Note that this can also be found in the output of mmc extcsd read /dev/block/mmcblk0 (replace with a device of your choice). The command is part of the mmc-utils package available e.g. in Debian. I think that is more reliable as it receives updates with your OS. And btw the last value in this script (269) should be labeled ...TYP_B. The life time estimation values are both in tens of percents, so 0x03 would be 30% worn.