Yones Toptech BS1078 V2

= Identification =

The PCB has the following silkscreened on it: YONESTOPTECH-BS1078-20140125 V2-

In android, under Settings->About Tablet, you will find:
 * Model Number: Q102
 * Build Number: fiber_q102-eng 4.4.2 KOT49H DDR420 20140621

= Sunxi support =

Current status
Able to boot to serial console using mainline A31-Hummingbird dts and mainline kernel using sunxi_defconfig and root file system built with buildroot.

Manual build
No support in the community maintained sunxi-3.4 kernel is planned. Please skip to the next Mainline U-Boot/Mainline kernel sections.

Mainline U-Boot
Working on a real U-Boot defconfig for this tablet

For building mainline U-Boot, use the Hummingbird_A31_defconfig target.

Mainline kernel
Working on a real dts for this tablet

Use the sun6i-a31s-yones-toptech-bs1078-v2.dts device-tree file for the mainline kernel.


 * Use the rtl8723au driver in the staging drivers for WIFI. Setting ht_enable=0 when loading the driver to disable 802.11n seems to work better.  With 802.11n enabled, the driver drops packets.

= Tips, Tricks, Caveats =

FEL mode
The button triggers  FEL mode.

= Adding a serial port (voids warranty) =

Use the UART pads and an appropriate level shifter to attach a serial port to the tablet.

See the "Locating the UART" section for information on where the UART pads are located at.

See UART howto for information on how to communicate with the UART.

Device disassembly


Remove two metal screws on the right side of the device then use a guitar pick style plastic opening tool to separate the back panel from the tablet. See also Plastic tool howto.

Locating the UART


On the backside of the board there are two test points marked RX and TX which are the serial port. The entire back of the board is covered in black tape that must be peeled off to expose the the test points. After soldering wires to the test points, it is no longer possible to screw the board back into the case because of the thickness of the wires.

See UART howto for information on how to communicate with the UART.

= Pictures =

= Also known as =

= See also =