Playing around with the HTC TyTN II / Kaiser

For reasons that I cannot yet disclose, I have obtained a HTC TyTN II (aka Kaiser). This is my first (and hopefully last) Windows Mobile based device.

So far I've taken the device fully apart, unmounted all the shielding covers and took high-resolution photographs of each and every part of the phone. The resulting information is now that I'm aware of all the major components in the device, and I've started to do some data mining on those components.

As everyone knows, HTC used a Qualcomm MSM7200 based chipset in this device. The MSM integrates both the GSM baseband (DSP+ARM9) as well as the application processor (ARM11) and many other things. What's less known is the further peripheral configuration.

  • The Bluetooth and WiFi chips are from Ti (BRF6300 and WL125, respectively).
  • The power management unit is a Qualcomm PM7500
  • NAND+DRAM are in a multi-chip module (1.8V, 2GBit NAND x8, 1GBbit DRAM x32) from Samsung
  • The 3G/GSM RF part consists of Qualcomm's RFR6500 (receive with integrated GPS) and RTR6275 (transmit) as well as AWT6280, AWT6273 and AWT6273 amplifiers
  • There furthermore is a CPLD: Xilinx XC2C128 (3000 system gates, 128 macrocells).
  • For those interested, I'll go through my PCB photographs and will edit and publish them soon.

    I am now digging through all the various XDA/WM6 hacker information out there and trying to understand the various tools that can be used for further taking apart the software side. I've already managed to get into the bootloader, which apparently offers a standard USB serial emulation that can be accessed even from a Linux PC.

    Unfortunately the MSM7200 is a highly proprietary/closed chipset, and there is very limited public information available. I've already ran into this while evaluating potential hardware for OpenMoko at some point in the past. I became curious about this MSM7xxx chipset family when they were first added to the ARM-Linux machine type registry many months ago.

    Anyway, meanwhile Google seems to be doing a lot using this chipset, as they have recently announced the availability of a linux-msm.git tree. The source code should document many things such as GPIO assignments, IRQ's and contain drivers for most of the hardware (on the application processor side).

    Now if some of you ask yourselves if I have turned my back on OpenEZX and OpenMoko: No, that's not true. I'm just looking at this for a very peculiar reason. Hopefully I'm able to reveal more soon.