[coldfire-gnu-discuss] Coldfire 52235evb debug problem

[Nathan Braun]

Hi Roberto,

I use:

set $pc = _start
continue

@0x0000 there is the start address of the program and not the first
instruction on the ColdFire.

Please consider also the remarks in
http://www.codesourcery.com/archives/coldfire-gnu-discuss/msg00559.html
which addresses some issues when debugging from Flash. Maybe your
linker script links OK. The symbol _start must not point to 0x400
since the ColdFire expects memory access bit masks there. Otherwise
later the program will run into memory access exceptions.

Best regards
Nathan Braun

Roberto Abbiati schrieb:
> Hi,
> I'm using eclipse and Sourcery G++ Lite Edition with a coldfire EVM. I
> have used the FREERTOS code (Coldfire V2 RTOS and TCP/IP Demo).
> I can build the project and download the program in flash memory using
> freescale's "CF Flasher 3.1".
> Problems arise when I try to debug the code.
> To identify the problem, I have used the command prompt console and text
> commands. The steps are:
> 1/ m68k-elf-gdb RTOSDemo.elf
> RESPONSE:
> GNU gdb (Sourcery G++ Lite 4.3-54) 6.8.50.20080821-cvs
> Copyright (C) 2008 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later
> <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "--host=i686-mingw32 --target=m68k-elf".
> For bug reporting instructions, please see:
> <https://support.codesourcery.com/GNUToolchain/>...
>  
>  
>  
> 2/ (gdb) target remote | m68k-elf-sprite pe://USBMultilink m52235evb
> RESPONSE:
> Remote debugging using | m68k-elf-sprite pe://USBMultilink m52235evb
> m68k-elf-sprite: Opening P&E USBMultilink port 1 (USB1 : USB-ML-CF REF :
> Future
> MCF5223xPoE Badge (PE6011471))
> m68k-elf-sprite: Target reset
> 0x00000000 in __cs3_interrupt_vector_coldfire ()
>  
> 3/ (gdb) c
> Continuing.
> RESPONSE:
> Program received signal SIGTRAP, Trace/breakpoint trap.
> 0x0000000a in __cs3_interrupt_vector_coldfire ()
>  
> If I try to continue, I always obtain this kind of response.
>  
> Instead, if I try the step command:
>  
> (gdb) step
> RESPONSE:
> Single stepping until exit from function __cs3_interrupt_vector_coldfire,
> which has no line number information.
> and the program waits forever, so I must close the command prompt shell.
>  
> Could anyone help me?
> Thanks
>  
> Roberto

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