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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