Identification

Yones Toptech BD1078
Manufacturer	Yones Toptech
Dimensions	263mm x 165mm x 12mm
Release Date	April 2014
Specifications
SoC	A20 @ 1Ghz
DRAM	1GiB DDR3 @ 408MHz
NAND	8/16/32GB
Power	DC 5V @ 2A, 6000mAh 3.7V Li-Ion battery
Features
LCD	1024x600 (10.1" 16:9)
Touchscreen	5-finger capacitive (Silead GSL1680)
Video	HDMI (Type C - mini)
Audio	3.5mm headphone plug, HDMI, internal stereo speakers, internal microphone
Network	WiFi 802.11 b/g/n (Realtek RTL8723AS)
Storage	µSD
USB	1 USB2.0 Host, 1 USB2.0 OTG
Camera	0.3MP (640x480) front, 2.0MP (1600x1200) rear
Other	Accelerometer (Memsic MXC622x), Bluetooth (Realtek RTL8723AS)
Headers	UART

The PCB has the following silkscreened on it:

YONESTOPTECH-BD1078-20131105

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

Model Number: AX105
Build Number: wing_bd1078-eng 4.2.2 JDQ39 20140307 test-keys

Sunxi support

Current status

The device is supported and maintained in mainline U-Boot. There is no mainstream kernel support at this point.

Some features are missing on Linux (sunxi-3.4 branch):

USB OTG doesn't work on the external connector (common to all sun7i devices) and it doesn't seem to work in either host or device mode
Wi-Fi and Bluetooth are untested

Mainline U-Boot

For building mainline U-Boot, use the Yones_Toptech_BD1078 target.

Manual build

For building u-boot, use the Yones_Toptech_BD1078 target.
The .fex file can be found in sunxi-boards as yones_toptech_bd1078.fex

Everything else is the same as the manual build howto.

Tips, Tricks, Caveats

FEL mode

Any button (VOL-, VOL+, BACK) triggers FEL mode from boot1.

Sending '2' over UART at boot triggers FEL mode from boot1.

USB storage mode

Sending '1' over UART at boot triggers an USB storage mode that exposes the nanda partition as well as the Android external storage.

Reset button

The reset button (on the side of the device) reboots the device.

Internal µSD card

The device has an internal µSD card port that shows as mmcblk1. This port doesn't have boot priority over NAND.

Adding a serial port (voids warranty)

Yones Toptech BD1078 UART pads

Device disassembly

In order to open the device, there are two Phillips screws to remove from the side with the connectors. The pins from the white part are easy to pop but it is advised to use a a plastic tool, starting from the side with the connectors. The front panel is very fragile and pressuring the screen to pop open the pins can easily end up in breaking the touch screen panel.

Locating the UART

The UART pads are located on the back of the PCB. There is a plastic film that protects the back of the board from shorting with the back of the LCD panel. The pads are clearly labeled on the PCB: GND, Rx, Tx. It is advised to put the plastic film back after soldering connectors according to the UART howto.