Semitime Qt840a

Jump to navigation Jump to search
Semitime Qt840a
Qt840a front.jpg
Manufacturer Semitime
Dimensions 100mm x 100mm x 23mm
Release Date November 2013
Website Device Product Page
SoC A20 @ 1Ghz
DRAM 512MiB DDR3 @ 384MHz
Power DC 5V @ 2A
Video HDMI (Type A - full), 3.5mm A/V connector
Audio 3.5mm A/V connector, HDMI, internal microphone
Network WiFi 802.11 b/g/n (Broadcom AP6330), 10/100Mbps Ethernet (ICplus IP101GA)
Storage µSD
USB 2 USB2.0 Host, 1 USB2.0 OTG
Other Bluetooth (Broadcom AP6330), IRDA
Headers UART, JTAG

This page needs to be properly filled according to the New Device Howto and the New Device Page guide.

This HTPC uses a pretty common case design, and sometimes can be found as the Q5 or I12_TvBox or unbranded. But whereas the Q5 or I12_TvBox use a Ampak AP6210 Wifi/BT module, the QT840 uses the Ampak AP6330.


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

  • Model Number: SoftwinerEvb
  • Build Number: homelet_sugar 4.2.2 JDQ39 xxxxx test-keys

Sunxi support

Current status





Manual build

  • For building u-boot, use the "qt840a" target.
  • The .fex file can be found in sunxi-boards as qt840a.fex

Everything else is the same as the manual build howto.

Mainline kernel

Use the sun7i-a20-i12-tvbox.dts device-tree file for the mainline kernel.

Tips, Tricks, Caveats

FEL mode

The push button on the rearside of the board triggers FEL mode.


There are some JTAG pads right next to the UART pads. Here is the pin-out:

  • TP3: JTAG-MS
  • TP4: JTAG-CK
  • TP5: JTAG-DO
  • TP6: JTAG-DI

Adding a serial port (voids warranty)

QT840a UART pads

Device disassembly

Only clips attach the top of the case to the rest of it. Insert your plastic tool along the top edge, and gently push the outside rim outwards, the clips should soon release.

Locating the UART

There are some clearly visible test pads next to the SoC. All you need to do is attach some wires according to our UART howto.


  • TP1: UART0-TX
  • TP2: UART0-RX


Take some pictures of your device, upload them, and add them here.

Also known as

See also