Pi is a Chinese device. 
We want port Openmoko to Pi, All free software

1. open the case

2. take off the cover of PCB
   then you will send the "GND" and "TXD"
   and th TP74 is the "RXD"
   you can get serial output from those pins 

3. you need a "RS-232 <--> TTL" converter to 
   get the correct output date

CPU Jz4740:

Jz4740 is a multimedia application processor targeted at mobile devices 
PMP. Incorporates the XBurst CPU core based on leading 
micro-architecture technology, this processor provides high integration, 
high performance and a low power consumption solution for embedded devices.