[coldfire-gnu-discuss] Using m68k-elf-cfpe-stub with our own board

[David Brown]

David Brown wrote:
> Can anyone give me some pointers to getting board setup to work 
> correctly using CodeSourcery's gdb and stub?  I have two problems - I 
> can't see how to set (or view) cpu space registers, and I can't get the 
> stub to use my own board configuration file.
> 
> I'm used to using a older version of gdb, patched with bdm support (from 
> bdm.sourceforge.net).  My board setup is done with commands in a 
> .gdbinit file such as:
> 
> bdm-write-creg 0xc05 0x10000001
> 
> I can't find any way to do something similar with the CodeSourcery tools.
> 
> The cfpe-stub program appears to do a certain amount of board setup, 
> based on the "-t" parameter.  For example, when called with 
> "m68k-elf-cfpe-stub -t m5213evb", creg 0xc05 (aka RAMBAR) is apparently 
> set to 0x20000001.  I'd like to use my own target setup, but I can't 
> find any information on the configuration file syntax (the CodeSourcery 
> documentation refers to the Code Worrier documentation, but I've no 
> plans to download hundreds of megabytes of Code Worrier if I can avoid 
> it).  I tried using a cfg file from FreeScale's flash programmer, but 
> that does not seem to work.  If anyone has an example configuration 
> file, I expect I can figure out what changes I'd need for my own use.
> 
> mvh.,
> 
> David
> 
> 

It turns out that you can get the Code Worrier user's guide from without 
downloading the whole lot, from:

http://www.freescale.com/files/soft_dev_tools/doc/user_guide/COLDFIREUG.pdf

As an example (in case it is of use to others), my "board.cfg" file is:

; Set RAMBAR for ram access
writecontrolreg 0xc05 0x10000221
writemem.l 0x40000008 0x10000200

; Set SYNCR for x8 clock
writemem.w 0x40120000 0x2007



I'd still like to know how to change cpu-space registers from with gdb, 
if anyone has any ideas - for some processors, it is important to be 
able to do things like turn caching on and off while debugging.


mvh.,

David