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

[Nathan Sidwell]

> 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

Glad you found that.  We were unable to get permission to distribute those 
config files.

Our upcoming update to the tools has implemented a much better xml based 
initialization scheme, which we have fully documented.  It specifies both board 
initialization and board memory maps.

> 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.

This is not possible with the current gdb -- the bdm.sourceforge.net patches 
have not been contributed to FSF gdb.  That said, control register access from 
gdb is on our todo list, but won't be available in the near term.

In the meantime you could include a function of the form

void set_cache_debug (unsigned v) {
   __asm__ __volatile__ ("movec.l %0,%/cacr" :: "r" (v) : "memory");
}

in your application and use it from gdb with

(gdb) call set_cache_debug(0xWHATEVER)


nathan

-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery
nathan at codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk