Sony Mobile is continuing its strong developer focus by releasing detailed information on how one can access the UART (Universal Asynchronous Receiver Transmitters) ports on several Sony Xperia devices. The UART port is built into the motherboard of your smartphone and makes Linux kernel development and debugging easier.
Be warned though, this is strictly for developers only who are aware of the benefits of accessing the phone through an UART port. You could end up damaging your motherboard if you’re not careful, as you will need to solder on the motherboard of your Xperia to access the port. So, decent soldering skills are a must. To identify and connect the right pins for your Sony Xperia device, click on the full instructions here, which also includes pictures of exactly where the ports are. Detailed information is provided for all Xperia phones currently in the Open Device program.
Via Sony Developer World.