Setting up ARM7 MMU using gdbinit

[Richard Earnshaw]

> I am developing a project using a Cirrus Logic 7312 ARM720 CPU. I would 
> like to debug my code from RAM, but the executable is larger than the on 
> chip SRAM. Also, the SDRAM interface does not work unless the CACHE is 
> enabled (and therefore MMU enabled) (Cirrus Logic errata :-( ). 
> Unfortunately, setting up the MMU requires access to Coprocessor 
> register 15 (through the mcr assembly instruction). Is there a way to 
> get to the coprocessor registers from the gdbinit script so that I can 
> setup the MMU prior to downloading my application into the SDRAM? I have 
> considered writing the mcr instruction op code in to memory and single 
> stepping over the instruction, but this seems a bit painful. Any help 
> would be greatly appreciated!

Sorry, at this time there is no way to directly access the co-processor 
registers from gdb other than by making the target run MRC/MCR 
instructions.

R.