PocketBook Touch Lux 2 (626)

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PocketBook Touch Lux 2 (626)
PB626 TL2.png
Manufacturer PocketBook
Dimensions 114.6mm x 174.4mm x 8.3mm
Release Date Month year
Website [1]
Specifications
SoC A13 @ 1Ghz
DRAM 256MiB DDR3 @ ??MHz
NAND N/A
Power DC 5V @ 3A, 1500mAh 3.7V Li-Ion battery
Features
Touchscreen  ?-finger capacitive(Manufacturer device)
Video N/A
Audio N/A
Network WiFi 802.11 b/g/n (Manufacturer device), 10/100/1000Mbps Ethernet (Manufacturer device)
Storage 2 x µSD (1 internal, 1 external)
USB 1 USB2.0 Host
Camera none
Other eInk "backlight"
Headers UART

This page needs to be properly filled according to the New Device Howto and the New Device Page guide.

This device has an eInk device, dmesg shows an EPDC driver is used. An almost identical device exists, the PocketBook Touch Lux 3. Mother board has some subtle differences, both uses the same firmwares.

Identification

This section explains how to most easily identify your device. For a development board, explain the name(s) printed on the board. For an android device, find out the strings as reported under settings.

On the back of the device, the following is printed: 

Manufacturer Marketing Name
ModelNumber

The PCB has the following silkscreened on it: 

E026 PB626V1.4
20140625

Sunxi support

Current status

Give a brief overview of the current status of support under sunxi here.

Images

Optional. Add MANUFACTURER DEVICE specific sunxi ROM images here. E.g. a livesuit image or some other linux image which uses linux-sunxi code. Do not put non-sunxi images here, they should live under See also. If no sunxi based images are available, this section can be removed.

HW-Pack

Optional. Add MANUFACTURER DEVICE sunxi HW-pack specifics here. When empty, this section can be removed.

BSP

Manual build

You can build things for yourself by following our Manual build howto and by choosing from the configurations available below.

U-Boot

Sunxi/Legacy U-Boot

Use the MANUFACTURER_DEVICE build target.

Mainline U-Boot

I tried tweaking the A13-OLinuXino_defconfig. Added: CONFIG_MMC_SUNXI_SLOT_EXTRA=2 to get u-boot doing something.

There are obvious issues with MMC detection. MMC2 (internal slot) seems to work perfectly, whereas MMC0 (external slot) does not really work. It seems detected ("mmc list" command) but issuing "mmc dev 0" has no effect: command returns code 1 with no error message.

Even with this, it is still possible to boot a mainline linux kernel, but it has the same issue with external slot.

Linux Kernel

Sunxi/Legacy Kernel

Use the MANUFACTURER_DEVICE.fex file.

Mainline kernel

Please look at the "discussion" tab of this page, I added some notes.


I tried tweaking the "sun5i-a13-olinuxino" device-tree. But there is an issue at this point with at least the external mmc slot (0): 

/sys/kernel/debug # cat mmc0/ios
clock:          0 Hz
vdd:            0 (invalid)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     0 (off)
bus width:      0 (1 bits)
timing spec:    0 (legacy)
signal voltage: 0 (3.30 V)
driver type:    0 (driver type B)
/sys/kernel/debug # cat mmc1/ios
clock:          50000000 Hz
actual clock:   50000000 Hz
vdd:            21 (3.3 ~ 3.4 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      2 (4 bits)
timing spec:    2 (sd high-speed)
signal voltage: 0 (3.30 V)
driver type:    0 (driver type B)

But that did not help since everything seems good in device tree (clock definition, bus width etc.).

Tips, Tricks, Caveats

Please look at the "discussion" tab of this page, I added some notes.

Manufacturer SD image boots the old boot0 / boot1 / boot.axf way, then starts an uImage Linux 3 kernel (as of firmware 5.14.1225). We can find source code for the kernel here, but I think it is incomplete, and while I built it successfully, I have not been able to boot it.

FEL mode

Entering FEL mode with default pocketbook software: device powered off, press right button (square symbol), power on while keeping the button pressed. There is not LED or indicator showing if the device is on. However plugging the device to a computer through USB will show there is something. lsusb: 

Bus 002 Device 008: ID 1f3a:efe8 Onda (unverified) V972 tablet in flashing mode


Serial console output will look like: 

dram size =256
0xffffffff,0xffffffff
super_standby_flag = 0
HELLO! BOOT0 is starting!
boot0 version : 1.5.0
The size of Boot1 is 0x00038000.
Succeed in loading boot1 from sdmmc flash.
Ready to disable icache.
Succeed in loading Boot1.
Jump to Boot1.
[       0.240] boot1 version : 1.5.1
[       0.240] pmu type = 3
[       0.241] bat vol = 4139
[       0.243] core_para->vol_threshold=3600
[       0.248] bat_cou=0x00000000
[       0.249] dcin_exist
[       0.252] power_step_level =0x00000002, bat_vol = 0x0000102b
[       0.291] axi:ahb:apb=3:2:2
[       0.291] set dcdc2=1400, clock=1008 successed
[       0.293] key
[       2.560] you can unclench the key to update now
[       2.560] key found, jump to fel

Device will answer to sunxi-fel: 

AWUSBFEX soc=00001625(A13) 00000001 ver=0001 44 08 scratchpad=00007e00 00000000 00000000


To get out of FEL mode, press power button for 10s.

Device specific topic

Pocketbook uses a strange partition layout on this device: 

626.img1       1009664 7763967 6754304   3.2G  b W95 FAT32
626.img2  *      73728  139263   65536    32M  6 FAT16
626.img3             1 1009664 1009664   493M 85 Linux extended
626.img5        139264  172031   32768    16M 83 Linux
626.img6        172032  204799   32768    16M 83 Linux
626.img7        204800  275455   70656  34.5M 83 Linux
626.img8        275456  776191  500736 244.5M 83 Linux
626.img9        776192  976895  200704    98M 83 Linux
626.img10       976896 1009663   32768    16M 83 Linux

boot1 seems to check a MBR at 0x01400000. Feeding it to sunxi-nand gives the following output: 

check partition table copy 0: mbr: version 0x00000100, magic softw311
OK
check partition table copy 1: mbr: version 0x00000100, magic softw311
OK
check partition table copy 2: mbr: version 0x00000100, magic softw311
OK
mbr: version 0x00000100, magic softw311
8 partitions
partition  1: class =         DISK, name =   bootloader, partition start =    32768, partition size =    65536 user_type=0
partition  2: class =         DISK, name =          env, partition start =    98304, partition size =    32768 user_type=0
partition  3: class =         DISK, name =         boot, partition start =   131072, partition size =    32768 user_type=0
partition  4: class =         DISK, name =       rootfs, partition start =   163840, partition size =    70656 user_type=0
partition  5: class =         DISK, name =      ebrmain, partition start =   234496, partition size =   500736 user_type=0
partition  6: class =         DISK, name =       secure, partition start =   735232, partition size =   200704 user_type=0
partition  7: class =         DISK, name =     updatefs, partition start =   935936, partition size =    32768 user_type=0
partition  8: class =         DISK, name =        UDISK, partition start =   968704, partition size =  6754304 user_type=0

Which is consistent with fdisk output considering the 0x0140000 offset.

Altering primary partition #1 and adding primary partition #4 is fine even if the MBR at 0x01400000 is not modified. But removing the other partitions makes boot1 fail the fs check and enter FEL mode.

...

Adding a serial port (voids warranty)

DEVICE UART pads

Serial TTL signal pads are clearly labeled on the board. Soldering is required.

Device disassembly

Insert the Plastic_tool between the back cover and the front cover. You can look at this video https://www.youtube.com/watch?v=c7AUData0UA Personally, I am using Dunlop 1.14mm guitar picks, it is not the most convenient but does the job.

Locating the UART

Describe how to find the RX,TX,GND signals here, and mention the UART howto.

Pictures

Take some pictures of your device, upload them, and add them here. DO NOT UPLOAD PICTURES WHICH YOU PLUCKED OFF THE INTERNET.

  • Device front.jpg
  • Device back.jpg
  • Device buttons 1.jpg
  • Device buttons 2.jpg
  • PB626 TL2 - board.jpg
  • PB626 TL2 - board2.jpg

Also known as

List rebadged devices here.

See also

Add some nice to have links here. This includes related devices, and external links.

Manufacturer images

Optional. Add non-sunxi images in this section.

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