It is a custom digital baseband architecture (DBB). It consist from:
- DSP Processor - TMS320C55x+ - based
- MCU (general purpose processor) - ARM9 - based
Both communicated with each other over the shared memory
Source DIA file: Wrigley3G
As and AP (OMAP3430) Wrigley3G use one memory chip, but another partition.
You can use radare2 tool for both c55x+ and arm disassembly. For example:
$ r2 -a c55x+ some_c55x_plus_binary.bin
It do basic jump analysis too.