YBKJ A20

= Identification = PCB Board marked with "YBKJ_A20_V3.0". There are no other identifiable markings.

In android, under Settings->About Tablet, you will find:
 * Model Number:  SoftwinerEvb
 * Build Number:  sugar_ref001-eng 4.2.2 JDQ39 20131115 test-keys
 * Android Kernel: 3.3.0 zhoujiequan@zhoujiequan-desktop #25

= Sunxi support =

Current status

 * U-boot patch still missing.
 * Sunxi kernel 3.4 + Debian armhf confirmed working
 * No DTB for mainline yet.

Manual build

 * For building u-boot, use the "" target.
 * The .fex file can be found in sunxi-boards as ybkj_a20.fex

Everything else is the same as the manual build howto.

= Tips, Tricks, Caveats =

FEL mode
There is no USB OTG so FEL mode is pointless. However, it can be triggered by sending '2' via the serial console as normal.

= Adding a serial port (voids warranty) =



Device disassembly
Lid is held on with a few plastic clips. I was able to remove it without any tools as it was quite loose. Just pull it off with your fingernails.

Locating the UART
Connector J10 is conveniently silk screened with pinout for serial port. Just solder on jumper leads according to our UART howto.

= Pictures =

= Also known as =

Sold under many descriptions on Ebay.

= See also =

There's another board with the exact same PCB labelled TXCZ_A20_V3.0 but with different chips (so, would require different kernel modules).