See https://www.mobileread.com/forums/showthread.php?t=325185 and its associated code repository https://github.com/ezdiy/pbjb
Required space is around 1.5GB once compressed, more if the internal storage was modified (added books, dictionaries, TTS voices, etc.).
Once inserted, the external SD is automatically mounted at /mnt/ext2/
# dd bs=1M if=/dev/mmcblk0 | gzip -c | split -b 4095m - /mnt/ext2/mmcblk0--dd.gz. &
# watch -n5 'kill -USR1 $(pgrep ^dd)'Since the InkPad 3 uses a FAT32 filesystem for the SD, size is limited to 4GB per file. You may opt to dump the device with no compression (because the embedded SoC, Allwinner B288, is a very slow dual-core ARM CPU) but retain the split part: remove the | gzip -c part.
Hit Ctrl+C when the dd program ends and there is no process to monitor.
- /sys/block/mmcblk0/device/cid
- /sys/block/mmcblk0/device/csd
Historically on devices booting on the hidden internal SD (PocketBook 626), they would bootloop when swapping the original SD for a cloned larger one, because of a check in monitor.app. See https://www.mobileread.com/forums/showthread.php?t=278728
$ mount
| device | mountpoint | type |
|---|---|---|
| rootfs | on / | (rootfs) |
| dev/root | on / | (ext2) |
| /dev/mmcblk0p2 | on /boot | (ext2) |
| /dev/ebrmain | on /ebrmain | (ext2) |
| /dev/secure | on /secure | (ext2) |
| /dev/loop0 | on /ebrmain/cramfs | (cramfs) |
| /dev/user_int | on /mnt/ext1 | (vfat) |
| /dev/user_extp1 | on /mnt/ext2 | (vfat) |
$ cat /etc/fstab
| device | mountpoint | type | opts etc. |
|---|---|---|---|
| none | /proc | proc | defaults 0 0 |
| none | /dev/pts | devpts | mode=0622 0 0 |
| tmpfs | /dev/shm | tmpfs | defaults 0 0 |
| /dev/ebrmain | /ebrmain | auto | ro 0 0 |
| /dev/secure | /mnt/secure | auto | defaults 0 0 |
| /ebrmain/cramfs.img | /ebrmain/cramfs | auto | defaults,loop 0 0 |
| /dev/mmcblk0p2 | /boot | auto | ro 0 0 |
fstab from swupdate (Extracted from SWUPDATE.BIN with the "SynkActiv" script):
none /proc proc defaults 0 0
none /dev/pts devpts mode=0622 0 0
tmpfs /dev/shm tmpfs defaults 0 0
/dev/ebrmain /ebrmain auto ro 0 0
/dev/secure /mnt/secure auto defaults 0 0
/ebrmain/cramfs.img /ebrmain/cramfs auto defaults,loop 0 0
/dev/bootfs /boot auto ro 0 0
fdisk -l: blank response
# dd if=/dev/mmcblk0boot0 of=/mnt/ext2/mmcblk0boot0.dd
# dd if=/dev/mmcblk0boot1 of=/mnt/ext2/mmcblk0boot1.dd
cat /proc/partitions
| major | minor | #blocks | name |
|---|---|---|---|
| 7 | 0 | 120004 | loop0 |
| 179 | 0 | 7634944 | mmcblk0 |
| 179 | 1 | 6793216 | mmcblk0p1 |
| 179 | 2 | 32768 | mmcblk0p2 |
| 179 | 3 | 1 | mmcblk0p3 |
| 179 | 5 | 16384 | mmcblk0p5 |
| 179 | 6 | 34816 | mmcblk0p6 |
| 179 | 7 | 65536 | mmcblk0p7 |
| 179 | 8 | 524288 | mmcblk0p8 |
| 179 | 9 | 131072 | mmcblk0p9 |
| 179 | 224 | 4096 | mmcblk0boot1 |
| 179 | 208 | 4096 | mmcblk0boot0 |
| 179 | 16 | 61897728 | mmcblk1 |
| 179 | 17 | 61896704 | mmcblk1p1 |
Notice how the block count seems off for mmcblk0p3
# fdisk -l
Disk /dev/mmcblk0: 7456 MB, 7818182656 bytes, 15269888 sectors
954368 cylinders, 1 heads, 16 sectors/track
Units: cylinders of 16 * 512 = 8192 bytes
| Device | Boot | StartCHS | EndCHS | StartLBA | EndLBA | Sectors | Size | Id | Type |
|---|---|---|---|---|---|---|---|---|---|
| /dev/mmcblk0p1 | * | 0,0,0 | 0,0,0 | 1683456 | 15368191 | 13684736 | 6682M | b | Win95 |
| Partition 1 does not end on cylinder boundary | |||||||||
| /dev/mmcblk0p2 | 0,0,0 | 0,0,0 | 73728 | 139263 | 65536 | 32.0M | 6 | FAT16 | |
| Partition 2 does not end on cylinder boundary | |||||||||
| /dev/mmcblk0p3 | 0,0,0 | 0,0,0 | 1 | 1544192 | 1544192 | 754M | 5 | Extended | |
| Partition 3 does not end on cylinder boundary | |||||||||
| /dev/mmcblk0p5 | 0,0,0 | 0,0,0 | 139264 | 172031 | 32768 | 16.0M | 83 | Linux | |
| /dev/mmcblk0p6 | 0,0,0 | 0,0,0 | 172032 | 241663 | 69632 | 34.0M | 83 | Linux | |
| /dev/mmcblk0p7 | 0,0,0 | 0,0,0 | 241664 | 372735 | 131072 | 64.0M | 83 | Linux | |
| /dev/mmcblk0p8 | 0,0,0 | 0,0,0 | 372736 | 1421311 | 1048576 | 512M | 83 | Linux | |
| /dev/mmcblk0p9 | 0,0,0 | 0,0,0 | 1421312 | 1683455 | 262144 | 128M | 83 | Linux |
Partition table entries are not in disk order
Disk /dev/mmcblk0boot1: 4 MB, 4194304 bytes, 8192 sectors
128 cylinders, 4 heads, 16 sectors/track
Units: cylinders of 64 * 512 = 32768 bytes
Disk /dev/mmcblk0boot1 doesn't contain a valid partition table
Disk /dev/mmcblk0boot0: 4 MB, 4194304 bytes, 8192 sectors
128 cylinders, 4 heads, 16 sectors/track
Units: cylinders of 64 * 512 = 32768 bytes
Disk /dev/mmcblk0boot0 doesn't contain a valid partition table
# blkid /dev/mmcblk0p*
/dev/mmcblk0p1: LABEL="Vivlio" UUID="4B3D-7544"
/dev/mmcblk0p2: LABEL="Volumn"
/dev/mmcblk0p7: UUID="da0bb0fb-8c84-477c-b781-1f8c7b6c5016"
/dev/mmcblk0p8: UUID="04ce3511-5916-48d5-99be-c57f0bc955f1"
/dev/mmcblk0p9: UUID="e3f04df8-c1d9-4de3-8640-b40d3a2ee37e"# df -h
| Filesystem | Size | Used | Available | Use% | Mounted | on |
|---|---|---|---|---|---|---|
| /dev/root | 63.6M | 19.8M | 40.6M | 33% | / | |
| none | 128.0M | 504.0K | 127.5M | 0% | /var | |
| /dev/mmcblk0p2 | 63.9M | 12.8M | 51.0M | 20% | /boot | |
| tmpfs | 498.1M | 4.0K | 498.1M | 0% | /var/dev/shm | |
| /dev/ebrmain | 507.7M | 301.0M | 181.1M | 62% | /ebrmain | |
| /dev/secure | 124.0M | 41.6M | 76.0M | 35% | /mnt/secure | |
| /dev/loop0 | 220.6M | 220.6M | 0 | 100% | /ebrmain/cramfs | |
| /dev/user_int | 6.5G | 1.1G | 5.4G | 17% | /mnt/ext1 | |
| /dev/user_extp1 | 59.0G | 1.2G | 57.8G | 2% | /mnt/ext2 | |
| /dev/secure | 124.0M | 41.6M | 76.0M | 35% | /ebrmain/cramfs/bin/netagent | |
| /dev/secure | 124.0M | 41.6M | 76.0M | 35% | /lib/modules/ins_usb_mod.sh | |
| /dev/secure | 124.0M | 41.6M | 76.0M | 35% | /lib/modules/rm_usb_mod.sh | |
| /dev/secure | 124.0M | 41.6M | 76.0M | 35% | /lib/modules/ins_usbnet.sh | |
| /dev/secure | 124.0M | 41.6M | 76.0M | 35% | /lib/modules/rm_usbnet.sh |
Note the dev/secure mounts are added by the jailbreak kit.
# find /var/dev -type l -exec ls -al {} ';'
lrwxrwxrwx 1 root root 6 Dec 1 23:19 /var/dev/input/keyboard0 -> event0
lrwxrwxrwx 1 root 100 9 Dec 1 23:19 /var/dev/secure -> mmcblk0p9
lrwxrwxrwx 1 root 100 3 Dec 1 23:19 /var/dev/fb -> fb0
lrwxrwxrwx 1 root 100 4 Dec 1 23:19 /var/dev/pvi_io -> zero
lrwxrwxrwx 1 root 100 4 Dec 1 23:19 /var/dev/rtc -> rtc0
lrwxrwxrwx 1 root 100 9 Dec 1 23:19 /var/dev/rootfs -> mmcblk0p7
lrwxrwxrwx 1 root root 7 Dec 1 23:19 /var/dev/misc/rtc -> ../rtc0
lrwxrwxrwx 1 root 100 9 Dec 1 23:19 /var/dev/ebrmain -> mmcblk0p8
lrwxrwxrwx 1 root 100 9 Dec 1 23:19 /var/dev/user_int -> mmcblk0p1
lrwxrwxrwx 1 root 100 4 Dec 1 23:19 /var/dev/pvi_ioc -> zero
lrwxrwxrwx 1 root 100 7 Dec 1 23:19 /var/dev/user_ext -> mmcblk1
lrwxrwxrwx 1 root 100 3 Dec 1 23:19 /var/dev/einkdrv -> fb0
lrwxrwxrwx 1 root 100 7 Dec 1 23:19 /var/dev/mxc_mem -> mxc_iim
lrwxrwxrwx 1 root 100 9 Dec 1 23:19 /var/dev/user_extp1 -> mmcblk1p1
lrwxrwxrwx 1 root 100 9 Dec 1 23:19 /var/dev/root -> mmcblk0p7
See https://linux-sunxi.org/PocketBook_Touch_Lux_2_(626)#Device_specific_topic for a similar layout Here we have A20-style NAND layout at 0x01400000 See https://github.com/linux-sunxi/sunxi-tools/blob/master/nand-part-a20.h
(all offsets below need to add 0x01400000 = 20 MB)
nandmbr-parse$ ./a.out SUNXIMBR.bin
SUNXIMBR.bin
check partition table
mbr: version 0x00000200, magic softw411
7 partitions
partition 1: class = DISK, name = bootfs, partition start = 32768, partition size = 65536 user_type=32768
partition 2: class = DISK, name = env, partition start = 98304, partition size = 32768 user_type=32768
partition 3: class = DISK, name = pbenv, partition start = 131072, partition size = 69632 user_type=32768
partition 4: class = DISK, name = rootfs, partition start = 200704, partition size = 131072 user_type=32768
partition 5: class = DISK, name = ebrmain, partition start = 331776, partition size = 1048576 user_type=32768
partition 6: class = DISK, name = secure, partition start = 1380352, partition size = 262144 user_type=32768
partition 7: class = DISK, name = UDISK, partition start = 1642496, partition size = 0 user_type=33024nandmbr-parse$ ./a.out SUNXIMBR2.bin
SUNXIMBR2.bin
check partition table
mbr: version 0x00000200, magic softw411
7 partitions
partition 1: class = DISK, name = bootfs, partition start = 32768, partition size = 65536 user_type=32768
partition 2: class = DISK, name = env, partition start = 98304, partition size = 32768 user_type=32768
partition 3: class = DISK, name = pbenv, partition start = 131072, partition size = 69632 user_type=32768
partition 4: class = DISK, name = rootfs, partition start = 200704, partition size = 131072 user_type=32768
partition 5: class = DISK, name = ebrmain, partition start = 331776, partition size = 1048576 user_type=32768
partition 6: class = DISK, name = secure, partition start = 1380352, partition size = 262144 user_type=32768
partition 7: class = DISK, name = UDISK, partition start = 1642496, partition size = 0 user_type=33024nandmbr-parse$ ./a.out SUNXIMBR3.bin
SUNXIMBR3.bin
check partition table
mbr: version 0x00000200, magic softw411
7 partitions
partition 1: class = DISK, name = bootfs, partition start = 32768, partition size = 65536 user_type=32768
partition 2: class = DISK, name = env, partition start = 98304, partition size = 32768 user_type=32768
partition 3: class = DISK, name = pbenv, partition start = 131072, partition size = 69632 user_type=32768
partition 4: class = DISK, name = rootfs, partition start = 200704, partition size = 131072 user_type=32768
partition 5: class = DISK, name = ebrmain, partition start = 331776, partition size = 1048576 user_type=32768
partition 6: class = DISK, name = secure, partition start = 1380352, partition size = 262144 user_type=32768
partition 7: class = DISK, name = UDISK, partition start = 1642496, partition size = 0 user_type=33024nandmbr-parse$ ./a.out SUNXIMBR4.bin
SUNXIMBR4.bin
check partition table
mbr: version 0x00000200, magic softw411
7 partitions
partition 1: class = DISK, name = bootfs, partition start = 32768, partition size = 65536 user_type=32768
partition 2: class = DISK, name = env, partition start = 98304, partition size = 32768 user_type=32768
partition 3: class = DISK, name = pbenv, partition start = 131072, partition size = 69632 user_type=32768
partition 4: class = DISK, name = rootfs, partition start = 200704, partition size = 131072 user_type=32768
partition 5: class = DISK, name = ebrmain, partition start = 331776, partition size = 1048576 user_type=32768
partition 6: class = DISK, name = secure, partition start = 1380352, partition size = 262144 user_type=32768
partition 7: class = DISK, name = UDISK, partition start = 1642496, partition size = 0 user_type=33024
graph LR
%%define classes
classDef classOk fill:green,color:#00FF00,stroke-width:2px,stroke:darkGreen;
classDef classWarn fill:orange,color:#FFF,stroke-width:2px,stroke:darkOrange;
classDef classDis fill:#eee,color:#000,stroke-width:0;
%%classDef node stroke:#0000ff,stroke-width:4px;
subgraph unmapped["fa:fa-microchip 36 MB unmapped data fa:fa-question-circle at SD card start"]
egon0-1("BOOT0_EMMC3<br/>fa:fa-hdd upto 32 KB<br/>fa:fa-map-marker-alt @192 KB (384*512)<br/>eGON.BT0 (4.0 boot0)<br/>'the Embedded GO-ON Bootloader System'")
---
egon0-2("BOOT0_EMMC3 backup<br/>fa:fa-hdd upto 32 KB<br/>fa:fa-map-marker-alt @256 KB (512*512)<br/>eGON.BT0 (4.0 boot0)")
---
uboottoc-backup("UBOOT-backup pkg<br/>fa:fa-hdd upto 4? MB<br/>fa:fa-map-marker-alt @12MB (24576*512)<br/>boot1 sunxi-package")
---
uboottoc-main("UBOOT pkg<br/>fa:fa-hdd upto 4? MB<br/>fa:fa-map-marker-alt @~16MB (32800*512)<br/>boot1 sunxi-package")
---
parttable("partitions<br/>fa:fa-hdd 64 KB<br/>fa:fa-map-marker-alt @20MB<br/>4x 16KB sunxi PT")
end
parttable --- mmcblk0p2
subgraph "mmcblk0p2: primary<br/>"
mmcblk0p2(("mmcblk0p2 (/dev/boot)<br/>fa:fa-hdd 32 MB [df says 64MB?]<br/>fa:fa-map-marker-alt @36MB<br/>FAT16 /boot"))
end
mmcblk0p2 --- mmcblk0p5
subgraph "mmcblk0p3: extended [protective?] fa:fa-hdd 754 MB (wrong fa:fa-map-marker-alt @.5MB in MBR)"
mmcblk0p5("mmcblk0p5<br/>fa:fa-hdd 16 MB<br/>fa:fa-map-marker-alt @68MB<br/>env")
---
mmcblk0p6("mmcblk0p6<br/>fa:fa-hdd 34 MB<br/>pbenv")
---
mmcblk0p7("mmcblk0p7 (/dev/root)<br/>fa:fa-hdd 64 MB<br/>EXT2 /")
---
mmcblk0p8("mmcblk0p8 (/dev/ebrmain)<br/>fa:fa-hdd 512 MB<br/>EXT2 /ebrmain")
---
mmcblk0p9("mmcblk0p9 (/dev/secure)<br/>fa:fa-hdd 128 MB<br/> /mnt/secure")
end
mmcblk0p9 --- mmcblk0p1
subgraph "mmcblk0p1: primary"
mmcblk0p1("mmcblk0p1 (/dev/user_int)<br/>fa:fa-hdd 6.5 GB<br/>fa:fa-map-marker-alt @822MB<br/>FAT32 /mnt/ext1")
end
%%Style subgraph/nodes
style unmapped fill:#eef,color:#33F,stroke-width:2px,stroke:darkBlue
class egon0-1,egon0-2,uboottoc-backup,uboottoc-main,parttable classDis
class mmcblk0p1 classOk
class mmcblk0p2 classWarn
- BOOT: 2 refs, only /boot/hwdevice found
- MNTsecure: 12 refs = fwinfo.txt + 11 dictionary *.lic
- User FAT32: 16 in raw, 9 refs = 8device.xml(7 deleted?) + 8 cookies
C:\EXTRACT\kaitai-struct-compiler-0.8\bin\kaitai-struct-compiler.bat -t all pocketbook-pb740-dd-dump.ksy$ sudo pip install kaitaistruct
(--user if you want, or create a venv)$ python pocketbook-pb740-dd-dump-to-files.py mmcblk0--ddYou may then use 7-zip GUI to extract or browse the partitions' contents.