[coldfire-gnu-discuss] Using GDB with Coldfire M52233DEMO ev-board..

[Paul McConkey]

[Quote]
I'am trying to get started with coldfire and have a ev-boad M52233DEMO.
I have loaded a program into flash using CF-flasher. And connected to
GDB through m68k-elf-cfpe-stub.exe. Whitout realy knowing what I'am
doing, I'am a complet novis on GDB, I have be able to get some basic
controll over the execution of my program. But I am not able make
breakpoints to work. If I set a breakpoint and then try to free run the
program to that breakpoint I
get:

"
(gdb) b GoAexit
Breakpoint 3 at 0x46a: file MyFile.S, line 106.
(gdb) continue
Continuing.
Warning:
Cannot insert breakpoint 3.
Error accessing memory address 0x46a: (undocumented errno -1).
"
If I try to single step I get the same problem untill I remove the
breakpoint.

Is this du to something I'am doing wrong or simply because the stub/gdb
is not able to handle this board?
[/Quote]



It sounds like you are trying to set a software breakpoint on code in
flash. The debugger needs to insert code at the break point so this will
only work if your code is executing in writable RAM.

Try setting a hardware assisted break point instead (I think that your
CPU should support one hw breakpoint). The gdb commands are the same as
for software breakpoints, but with an h in front:

(gdb) hb GoAexit

Cheers,
 
Paul.