Identification

Inet 86vs
Manufacturer	iNet technology
Dimensions	190 mm x 115mm x 9mm
Release Date	July 2013
Website	86VS Product Page
Specifications
SoC	A13 @ 1GHz
DRAM	512MiB DDR3 @ 408MHz
NAND	4GB
Power	5V @ ?A, 2800mAh 3.7V Li-Ion battery
Features
LCD	800x480 (7" 16:9)
Touchscreen	5-finger capacitive (Silead GSL1680)
Audio	3.5mm headphone plug, internal speaker, internal microphone
Network	WiFi 802.11 b/g/n (Realtek RTL8188ETV)
Storage	µSD
USB	1 USB2.0 OTG
Camera	0.3MP (640x480) front
Other	Accelerometer (Manufacturer device FIXME), reset button
Headers	UART

In android, under Settings->About Tablet, you will find:

Model Number: MID705
Build Number: A13_86VS_M758C1_1304117.20130629

Sunxi support

Current status

Supported.

WiFi reception is very poor probably due to bad antenna.

Tested:

boot from SD card - mmc0
PMU
original nand flash content access
LCD
USB OTG (ethernet gadget)
USB HOST (wifi)
tablet keys

Don't work:

touchscreen
networking

Untested (should work):

mali
cedar

Detected by kernel but needs testing:

rtc
USB WiFi
audio

Unknown:

accelerometer
camera

Images

HW-Pack

BSP

Manual build

For building u-boot, use the INet_86VS target.
The .fex file can be found in sunxi-boards as inet_86.fex

Everything else is the same as the manual build howto.

Tips, Tricks, Caveats

FEL mode

u-boot button pads between the battery (red and black) and WiFi antenna (gray) wires
u-boot test pads below WiFi subboard

The VOL+ button triggers FEL mode.

Alternatively, there is a pad labeled u-boot near the wifi. Connecting this to ground also triggers FEL mode. Pads for a UBOOT button are also available on the board.

Adding a serial port (voids warranty)

UART pads (under the plastic)

Some pads are available on the board, but they are multiplexed with the SD card. So use a MicroSD Breakout board. The ones from Sparkfun or DX should work with the cover on, but you have to remove the back cover to attach the cubietech one.

Device disassembly

Be careful to first remove the SD Card.

The tablet has screws next to the connectors. The board is on the display part and the bottom cover is removed. Remove the screws and pry the bottom cover open with your plastic tool.

Make sure the USB port is inserted into the cover first when reassembling.

Locating the UART

UART is marked on the bottom of the PCB (between the PCB and display) and on the top under the tape holding ctp connector. Both connect to the SD slot so you can as well use a SD breakout board. The FEX file does not enable UART.

UART1 pins are used for CSI and connected to a 24pin 0.5mm pitch FFC connector which is used for camera. Probing with a multimeter confirms that the console pins seem to be connected somewhere around the middle of the connector. The pitch is the same as IDE ZIF connector but IDE is 40pin.

It is possible to use a generic ffc and an IDE ZIF to 3.5" adaptor to connect to the pins routed to CSI. I can confirm using the u-boot gpio command that the pins actually connect to the ide connector when the cable is inserted properly but I cannot get the console working. Unfortunately the 24pin cable gets loose easily in 40pin connector.