Rockchip devices are a great platform for development: small, cheap and very hackable. In particular, here at cozybit, we bought some Tronsmart MK908 (RK3188) to do some Android hacking. It wasn’t long before we realized serial console was a feature we wanted, so basing on omegamoon’s work, this is what we did to gain access:
- Disassemble the plastic case to extract the board. Don’t worry, it’s simple to do without breaking anything.
- Take a look at the MK908 board and identify its version number. This recipe only works for v5.0. Other versions have different layouts (click here for v1.0 boards).
- Get a FTDI Basic Breakout for 3.3V (or similar) and a 5 pin breakaway male header.
- Solder the breakaway male header to the board matching the FTDI Basic Breakout pins with the next soldering points:
- The coppered square on top of the mentioned points is also a GND point. So, to make soldering easier, you can always solder the GND pin to it.
- Now connect it to your machine, start minicom (or the tool of your choice) and configure it with the next parameters: 115200 – 8N1 – NOR.
- Finally, secure your mod: make a small hole in the case, glue the breakaway male header and close it.
- One last note: if you are already using a custom kernel, make sure that all the FIQ options are enabled in your config file and that “ttyFIQ0” is the selected console.
Enjoy your MK908 v5 mod and happy hacking!!