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linux下读取eMMC信息

 1 year ago
source link: https://titron.github.io/2023/04/07/linux_read_emmc_info/
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linux下读取eMMC信息

转自Linux eMMC信息读取

在/sys/devices/platform/6b030000.esdhc/mmc_host/mmc0/mmc0:0001/目录下可以读取到cid、csd、dsr、ocr、寄存器的值.


# mount -t debugfs none /sys/kernel/debug/

@xxx:/sys/kernel/debug/mmc0 # cat ios


@xxx:/sys/kernel/debug/mmc0/mmc0:0001 # cat ext_csd
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

当然这样看很难看，无法很快的确认寄存器中某些位的值。因此，网上就有个小哥写了个python脚本来解析这512字节的数据，以常人可以理解的格式进行解析。详见：https://blog.kylemanna.com/linux/parse-emmc-extended-csd-ecsd-registers-with-python/ 输出的格式如下：

victor @victor-HP:~/ work2/cal_time$ python analysis_ext_csd.py 
0000:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0016:	39 03 00 c0   47 07 00 c0   47 07 00 00   00 00 00 00
0032:	00 01 01 00   00 00 00 00   00 00 00 00   00 00 00 00
0048:	00 00 00 00   00 00 00 00   00 00 00 00   0a 00 00 01
0064:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0080:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0096:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0112:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0128:	00 00 01 00   00 00 00 00   00 00 00 00   00 00 00 00
0144:	00 00 00 00   00 00 00 00   00 00 00 00   00 90 0e 00
0160:	07 01 00 00   00 00 15 1f   20 00 00 00   00 00 00 00
0176:	00 00 00 00   00 00 00 00   01 01 00 09   00 00 00 00
0192:	08 00 02 00   57 1f 0a 0a   ee ee 88 88   00 1e 0f 46
0208:	0f 78 14 01   00 c0 47 07   10 14 0a 0a   09 02 01 32
0224:	08 08 40 00   07 fd fb 55   01 00 64 0a   ee ee ee 99
0240:	01 1e 02 00   00 00 00 32   0a 00 10 00   00 ee 01 00
0256:	00 00 00 00   00 00 00 00   01 20 20 01   01 00 00 00
0272:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0288:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0304:	00 00 00 1f   01 00 00 00   00 00 00 00   00 00 00 00
0320:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0336:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0352:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0368:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0384:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0400:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0416:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0432:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0448:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0464:	00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00
0480:	00 00 00 00   00 00 01 ff   ff ff ff 00   00 01 03 00
0496:	7f 00 03 01   3f 3f 01 01   01 00 00 00   00 00 00 00
BOOT_SIZE_MULTI[226] = 0x20

Python内容如下：

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

    return out


if __name__ == '__main__':

    ecsd_str = '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'
    #ecsd_str = '320100'
    ecsd = str2bytearray(ecsd_str)
    csd_len = len(ecsd)

    line_len = 16
    i = 0
    while i < len(ecsd):
        sys.stdout.write("{0:04d}:\t".format(i))
        for j in range(line_len):
            if (i < csd_len):
                sys.stdout.write("{0:=02x}".format(ord(ecsd[csd_len-i-1])))
                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 "BOOT_SIZE_MULTI[226] = 0x{:x}".format(ord(ecsd[csd_len-168-1]))

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