gdb for multicore processors ?

[Kim Lux <lux@diesel-research.com>]

We need to port gdb to handle the Freescale (formerly Motorola)
68HC9S12X devices, which have 2 processors:  the main CPU called the
9S12 and an auxillary IO RISC processor called the XGATE processor.

Each processor has its own register set and instruction set.  They are
not the same.  They share the same memory map, but the xgate processor
addresses things differently.

I'll provide more details of the processors as people need them. 

We already handle the 9S12 CPU with gdb in the 68HC9S12 devices.  (No
XGATE on them.)  

We interface to the processor via a Background Debug Pod.  The 9S12X BDM
can set breakpoints for each processor independently. 

So... how do we set GDB up to handle this ?

We are building the BDM, so theoretically we could connect 2 gdb
processes to the same BDM, if that helps.  That would allow us to have a
separate GDB instance for each process.  Or should one GDB instance
handle both processors ?

The goal is to use gdb under Eclipse.  There it would be preferable to
have 2 separate instances of gdb.    


-- 
Kim Lux,  Diesel Research Inc.