Re: Disable watchdog timer in crt0.S & BSS initialization

Sorry for the confusion, I meant *.data* initialization... not *.bss*

Thanks,
Olivier

On Wed, Dec 3, 2014 at 10:54 PM, Olivier Girard <[email protected]> wrote:

> Hi all,
>
> I am currently updating the verification environment of the openMSP430 to
> support the new Redhat/TI GCC toolchain.
>
> The first thing I noticed is that the *crt0* code by default assumes that
> the watchdog WDTCTL register is mapped at 0x015c...
> Does someone knows if there is a magic switch to change the default
> behavior and map the register to 0x0120 ? (I hope to avoid a re-compile of
> the crt0.S stuff)
>
> Here is the snippet:
> "...
> Disassembly of section .text:
>
> 0000c010 <__start>:
>     c010: 31 40 00 04 mov #1024, r1 ;#0x0400
>
> 0000c014 <.Loc.39.1>:
>     c014: b2 40 80 5a mov #23168, &*0x015c* ;#0x5a80
>     c018: 5c 01
> ..."
>
>
> In addition, I am also experiencing problem with the initialization of
> global variables.
> For example I have a global variable initialized as following in my code:
> "...
> volatile char shift_direction = 0x01;  // Global variable
> ..."
>
> Now, when the CPU enters the main(), I noticed that the memory location
> where my variable is mapped to is not set 0x01...
> I assume that this initialization is meant to be done by the
> *__crt0_init_bss* procedure but it is somehow not working properly.
>
> As I also use a linker script provided with the new toolchain, I was not
> really expecting any problem on that side (note that everything worked
> perfectly with the MSPGCC port from Peter).
>
> I'm sorry for not being able to give you a better description (toolchains
> are definitely not by speciality :-/) but I would be happy about any
> suggestion... or maybe someone already experienced similar problems.
>
> BTW, here are my GCC calls:
> "...
> msp430-elf-gcc -mcpu=msp430 -mhwmult=none -O2 -Wall -g   -c -o main.o
> main.c
> msp430-elf-gcc -mcpu=msp430 -T linker.x -o sandbox.elf main.o
> ..."
>
>
> Thanks a lot in advance,
> Olivier
>
>
>
>

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