Inet K970

= Identification =

On the back of the device, the following is printed: Tristan Auron Planet 1

The PCB has the following silkscreened on it: INET-K970-REV02 Zeng-gc 2013-08-27

In android, under Settings->About Tablet, you will find:
 * Model Number: planet 1
 * Build Number: A20_K9701_K9701L2B_1210239.20121030

= Sunxi support =

Current status
Supported by the legacy u-boot-sunxi and sunxi-3.4 kernel.

Only partially working are:
 * Bluetooth

Currently broken for A20 is:
 * USB OTG

No drivers or suitable dts are readily at hand for the following devices:
 * Nand (mainline)
 * G-Sensor
 * Cameras

All devices not mentioned above are fully operational.

Manual build

 * For building u-boot, use the target.
 * The .fex file can be found in sunxi-boards as tristan-auron-planet-1.fex

Everything else is the same as the Manual build howto.

Mainline U-Boot


For building mainline u-boot, use the Tristan_Auron_Planet_1_defconfig target.

A patch is currently under review.

Until the patch and new various features hit the main repository, use the following u-boot as mainline: $ git clone -b sunxi-wip https://github.com/jwrdegoede/u-boot-sunxi/tree/sunxi-wip In particular, this allows an u-boot dialog using an usb-keyboard and the tablet's LCD.

Mainline kernel
= Tips, Tricks, Caveats =

FEL mode
The Vol+ button triggers FEL mode.

Reset button
Like with most Inet-tek tablets, a reset button is available through the pinhole on the back.

Sunxi
The keys are working. Use the sun4i_keyboard module. Test using evtest. The power-key is available using the input/event0 device provided by axp. Install acpid for controlled shutdown. Note the FEX power_start setting, which has an effect on reboot/halt, when connected to AC power.

Mainline
Buttons are currently hot in the pipelines, but work well. See this thread for references to patches.

The non-power keys additionally need some special device tree entries. This is a funny device, an ADC actually, where each key is identified by a particular voltage, naturally the values are device depend. For this tablet we have: KEY Volume Up  : voltage  158730 KEY Volume Down : voltage 952380 KEY ESC        : voltage 1142857

Sunxi
Works well, see /sys/class/power_supply.

Mainline
Currently the driver is in RFC state, see following thread.

Sunxi
The touchscreen works well with the ft5x_ts driver available in linux-sunxi (modulo the patch noted on the driver page). Some modifications were applied w.r.t. the original FEX file.

Mainline
Touchscreen works well. X-axis is reverted, the driver does not support a transformation. Contrary to the sunxi-driver, events generated by the driver do comply to the multi touch protocol.

Sunxi
Wifi is provided by a RTL8723AU. This is an USB device, attached to the third USB-bus. Some modifications were applied therefor w.r.t. the original FEX file.

Mainline
While the sunxi driver is the early original, it is maintained in the mainline kernel as staging. Works well.

Sunxi
Bluetooth works using the rtk_btusb module, though I had mixed success working towards full operation of a Bluetooth keyboard.

Most particular, the Weezy userspace is not operational, see e.g. here for some fun ahead. I had more success with bluez-5.23 and could reliably connect and use the keyboard.

Automatic connection failed though, which may or may not related to recognizable driver issues.

Mainline
Apparently, the RTL8723AU driver (r8728au) in mainline serves only wifi, though it has an option to coexist with BT.

Perhaps rtl8723au_bt, branch new is the work repository for a current bluetooth driver,

Sunxi
CONFIG_NAND is currently broken in sunxi-next and fixed by this patch.

Mainline
= Adding a serial port (voids warranty) =



Device disassembly
To open the tablet, first remove the two screws on the connector's side. As the picture aside shows, the back cover can most safely be lifted from the side opposite to the connectors. Try using a Plastic tool. A spool-like tool, shown with the opened device, worked better for me. Before trying to open the tablet, notice the eyelets on the back cover clearly visible both at the cover itself and its shadows. I found it best to open it first at one of the loops in the middle. Further take care of the speaker cables when lifting the back cover.



Locating the UART
The RX,TX pads are hidden under the touchscreen ribbon located on the right side of the board's front picture. To remove the ribbon, lift the connector's lever visible as a narrow dark bar at the upper edge of the white connector. The ribbon is released then and can be pulled out of the connector without force. The GND is textually marked at another place on the board close to the right upper edge of the board's front picture and connected to the large cooper area. See the gallery below for details.

= Pictures =

= Also known as =


 * Tristan Auron Planet 1
 * M973

= See also =