[Samsung Galaxy A40 Guides, News, & Discussion] tys0n:
$ ls -al /dev/block/platform/13500000.dwmmc0/by-name

total 0

drwxr-xr-x 2 root root 680 2019-07-08 13:45 .

drwxr-xr-x 3 root root 780 2019-07-08 13:45 ..

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 boot -> /dev/block/mmcblk0p15

lrwxrwxrwx 1 root root 20 2019-07-08 13:45 bota0 -> /dev/block/mmcblk0p1

lrwxrwxrwx 1 root root 20 2019-07-08 13:45 bota1 -> /dev/block/mmcblk0p2

lrwxrwxrwx 1 root root 20 2019-07-08 13:45 bota2 -> /dev/block/mmcblk0p6

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 bota3 -> /dev/block/mmcblk0p23

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 cache -> /dev/block/mmcblk0p28

lrwxrwxrwx 1 root root 20 2019-07-08 13:45 cm -> /dev/block/mmcblk0p7

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 cp_debug -> /dev/block/mmcblk0p30

lrwxrwxrwx 1 root root 20 2019-07-08 13:45 cpefs -> /dev/block/mmcblk0p5

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 dtb -> /dev/block/mmcblk0p17

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 dtbo -> /dev/block/mmcblk0p18

lrwxrwxrwx 1 root root 20 2019-07-08 13:45 efs -> /dev/block/mmcblk0p3

lrwxrwxrwx 1 root root 20 2019-07-08 13:45 m9kefs1 -> /dev/block/mmcblk0p8

lrwxrwxrwx 1 root root 20 2019-07-08 13:45 m9kefs2 -> /dev/block/mmcblk0p9

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 m9kefs3 -> /dev/block/mmcblk0p10

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 misc -> /dev/block/mmcblk0p14

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 nad_fw -> /dev/block/mmcblk0p31

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 nad_refer -> /dev/block/mmcblk0p11

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 omr -> /dev/block/mmcblk0p29

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 param -> /dev/block/mmcblk0p12

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 persistent -> /dev/block/mmcblk0p20

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 product -> /dev/block/mmcblk0p27

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 radio -> /dev/block/mmcblk0p19

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 recovery -> /dev/block/mmcblk0p16

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 reserved2 -> /dev/block/mmcblk0p24

lrwxrwxrwx 1 root root 20 2019-07-08 13:45 sec_efs -> /dev/block/mmcblk0p4

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 steady -> /dev/block/mmcblk0p21

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 system -> /dev/block/mmcblk0p25

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 up_param -> /dev/block/mmcblk0p13

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 userdata -> /dev/block/mmcblk0p32

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 vbmeta -> /dev/block/mmcblk0p22

lrwxrwxrwx 1 root root 21 2019-07-08 13:45 vendor -> /dev/block/mmcblk0p26

Edit:

More detailed output from fdisk with start / end sector , size, name.:

a40:/system/xbin # fdisk -l /dev/block/mmcblk0

Found valid GPT with protective MBR; using GPT

Disk /dev/block/mmcblk0: 122142720 sectors, 2296M

Logical sector size: 512

Disk identifier (GUID): 52444e41-494f-2044-4d4d-43204449534b

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 122142686

Number Start (sector) End (sector) Size Name

1 8192 16383 4096K bota0

2 16384 32767 8192K bota1

3 32768 73727 20.0M efs

4 73728 114687 20.0M sec_efs

5 114688 131071 8192K cpefs

6 131072 147455 8192K bota2

7 147456 163839 8192K cm

8 163840 172031 4096K m9kefs1

9 172032 180223 4096K m9kefs2

10 180224 188415 4096K m9kefs3

11 188416 190463 1024K nad_refer

12 190464 206847 8192K param

13 206848 223231 8192K up_param

14 223232 227327 2048K misc

15 227328 301055 36.0M boot

16 301056 409599 53.0M recovery

17 409600 425983 8192K dtb

18 425984 442367 8192K dtbo

19 442368 534527 45.0M radio

20 534528 535551 512K persistent

21 535552 543743 4096K steady

22 543744 544767 512K vbmeta

23 544768 545791 512K bota3

24 545792 557055 5632K reserved2

25 557056 10633215 4920M system

26 10633216 11976703 656M vendor

27 11976704 12992511 496M product

28 12992512 13811711 400M cache

29 13811712 13914111 50.0M omr

30 13914112 13924351 5120K cp_debug

31 13924352 13965311 20.0M nad_fw

32 13965312 122132479 51.5G userdata