Hi,
On 15-10-15 16:58, Benjamin Henrion wrote:
Hi,
I got Q88 tablet with a broken screen from the flea market for 4EUR.
Soldered the pins on the back for the serial port, got the console
working by powering the device from the USB port AND from the 5V DC
with a Nokia plug:
Hi I've bought a couple of q8 tablets the same way :)
So you say pins on the back, so I assume that this is an A13 device ?
A number of things:
1) Try building the latest upstream u-botot (from git master) with
the q8_a13_tablet_defconfig, and write that to an sdcard using:
sudo dd if=u-boot-sunxi-with-spl.bin of=/dev/sdc bs=1024 seek=8
Adjust /dev/sdc to point to your sdcard !
2) You say nokia plug, are you using a nokia charger ? The A13 based
boards will draw up to 2A when charging, and most nokia chargers
cannot deal with this, this also likely explains why you also need
to hookup usb too. Make sure you've a decent 5v 2A power-supply
hooked up to the power-barrel
3) The output you're seeing on the serial console is from the
part of the firmware which manages charging, if the battery is
too empty / your charger not powerful enough it will never get
past that. What you can do is:
a) insert microsd with u-boot from step 1.
b) press the power button for 12 seconds, this forces the board to go really
off.
c) press the power button for 4 seconds
Now you should see u-boot from the sd booting, and assuming only
the digitizer is broken and not the lcd you will also see a tux
on the lcd :)
If the lcd works, you can order a new digitizer here:
http://www.aliexpress.com/item/7-inch-Black-Touch-Screen-Digitizer-Glass-Touch-Panel-Allwinner-A13-Q8-tablet-pc-replacements-free/32213685488.html
This will cost you another 4 euro :)
But before doing so, measure the black bezel of the
digitizer on the top (camera) and bottom sides. On most tablets
it is 9 (top) / 10 (bottom) mm but on some it is only 7 / 8 mm,
the replacement digitizers by default are 9/10 and loosing 2 mm
of the screen on the top / bottom is quite annoying since that is
where status icons / start menu / etc. typically are.
If you've one of the 7 / 8 mm tablets, look at the part number
on the wire coming out of the digitizer and search for that
on ali express, likely you need this one:
http://www.aliexpress.com/item/Free-shipping-to-send-7-inches-100-original-brand-new-tablet-touchscreen-CZY6075E-FPC/32291760888.html
Note that the part-number is not only in the "subject" of the
advertisement but also in the "Model Number" entry in "item specifics"
this is important, otherwise you will still get the wrong digitizer.
Also note that this one is twice as expensive as the more standard one.
If the lcd is broken I would not bother with repairing the tablet,
if you want to replace the lcd you must also replace the battery
as their glue-ed together and forcibly removing the battery
will bend it, rendering it unusable (using bend lipo batteries
is a fire-hazard).
I hope this helps.
Regards,
Hans
==========================
dram size =512
0xa215aaa5,0x410b0413
super_standby_flag = 0
HELLO! BOOT0 is starting!
boot0 version : 1.6.0
Succeed in opening nand flash.
Succeed in reading Boot1 file head.
The size of Boot1 is 0x00064000.
The file stored in 0X00000000 of block 2 is perfect.
Check is correct.
Ready to disable icache.
Succeed in loading Boot1.
Jump to Boot1.
[ 0.156] boot1 version : 1.7.0
[ 0.156] pmu type = 3
[ 0.157] bat vol = 3313
[ 0.192] axi:ahb:apb=3:2:2
[ 0.192] set dcdc2=1400, clock=1008 successed
[ 0.194] key
[ 0.206] no key found
[ 0.206] flash init start
[ 0.206] NB1 : enter NFB_Init
[ 0.209] NB1 : enter phy init
[ 0.212] [NAND] nand driver(b) version: 0x0x00000002,
0x0x00000012, data: 0x20130602
[ 0.220] get the good blk ratio from hwscan : 912
[ 0.225] NB1 : nand phy init ok
[ 0.266] NB1 : init ok
[ 0.266] flash init finish
[ 0.266] fs init ok
[ 0.269] fattype FAT16
[ 0.271] fs mount ok
[ 0.277] script finish
[ 0.278] power finish
[ 0.278] nand ratio=912
[ 0.281] storage_type=0
[ 0.292] BootMain start
[ 0.292] 0
[ 0.320] init to usb pc
[ 0.343] power_start=0x00000002
[ 0.343] power trigger
[ 0.343] startup status = 0
[ 2.431] base bat_cal = 0
[ 6.831] extenal power low go high startup
[ 6.831] enter standby
==========================
The device does not go further. Any idea what I can do with it?
I tried to DD an image on a microsd card, still the same. I left the
device powered for 2 hours, still stuck at the same message.
Best,
--
Benjamin Henrion <bhenrion at ffii.org>
FFII Brussels - +32-484-566109 - +32-2-4148403
"In July 2005, after several failed attempts to legalise software
patents in Europe, the patent establishment changed its strategy.
Instead of explicitly seeking to sanction the patentability of
software, they are now seeking to create a central European patent
court, which would establish and enforce patentability rules in their
favor, without any possibility of correction by competing courts or
democratically elected legislators."
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