Porting GDB - Where to start?

[James Sampson]

Hello

In my GDB journey, I have now found out, that I need to port the GDB to C55x 
target. A recipe on how to do this, exists only in very light form. The best 
thing is to edit another port, and since I don't know which port to choose, I 
ask that exact question here.

Which port would be best to start from, when I'm porting to a C55x target 
which produces COFF files?.

Best Regards
James Sampson