YBKJ A20 JN

Similar black plastic case to the TXCZ A20 and the Langcent h6s HTPCs, but with slightly different PCB and no external WiFi antenna.

= Identification =

The device is completely generic, there are no labels of any kind and it comes in a plain brown cardboard box, obviously without any manual. The only markings on the black plastic case are the green Android Robot logo and "Smart Media Player" written in small characters.

The PCB has the following silkscreened on it: YBKJ_A20_JN_V2.2

In android, under Settings->About Tablet, you will find:
 * Model Number: SoftwinerEvb
 * Build Number: sugar_ref001-eng 4.2.2 JDQ39 20140403 test-keys

= Sunxi support =

Manual build
Everything else is the same as the manual build howto.
 * For building u-boot, use the YBKJ_A20_JN target.
 * The .fex file can be found in sunxi-boards as ybkj_a20_jn.fex

= Tips, Tricks, Caveats =

FEL mode
Between the DC power connector and the SPDIF, there is a pinhole. Behind this is the button which triggers FEL mode.



= Adding a serial port =

Device disassembly
The bottom half has a big clip in each corner, and small clips in the middle of all sides except the back. Carefully insert your Plastic tool between the two covers, and gently push the clips to the inside until you them release.

Be careful when opening the device, as the Wifi antenna is glued to the top cover.

Locating the UART
While there seem to be 3 UART connectors on the board, the one between the Wifi module and the RAM chip seems to be UART0. It is clearly labeled, just solder on some wires according to our UART howto.

= Pictures =

= Also known as =

= See also =
 * YBKJ A20: Another HTPC from the same manufacturer, different formfactor and PCB.
 * TXCZ A20: Same formfactor HTPC.
 * Langcent h6s: Same formfactor HTPC.