Hi again,
At last got some progress! :-)
The jump from the bootloader now works (but with one minor problem. plz
see below)
I found that the problem was caused by optimisation.
(and it was dumb of me not to pay attention to a warning: optimization
may eliminate reads and/or writes to register variables)
I should have not used -O option when I use a register variable.
Here is bootloader's code:
#define HAL_PLF_ARCH_GETRESETVECTOR(__reset,__vector) \
{ \
__reset = *((unsigned long*)(__vector+4)); \
register volatile CYG_ADDRESS __stack_ptr asm("sp");\
__stack_ptr = (*((unsigned long*)(__vector))); \
}
static volatile unsigned long exec;
int main (void) {
diag_printf( "JUMP\n" );
HAL_PLF_ARCH_GETRESETVECTOR(exec, 0x08020000);
((void (*)(void))exec)();
while (1);
return 0;
}
Here is app's code:
int main (void) {
diag_printf( "HELLO1\n" );
diag_printf( "HELLO2\n" );
while (1);
return 0;
}
But there is still some minor problem:
Please have a look at the terminal output:
JUMPC!▒11=▒
HELLO2
Notice that instead of "HELLO1" a garbage (C!▒11=▒) is printed out.
Where as the next HELLO2 is ok.
It is either something related to diag_print() that was not initialised
properly.
or may be something to do with thumb mode on Cortex-4?
here:
$ arm-none-eabi-nm -n app.elf | grep hal_reset_vsr
08020984 T hal_reset_vsr
where as exec is (08020984+1):
(gdb) next
28 ((void (*)(void))exec)();
(gdb) print/x exec
$3 = 0x8020985
any ideas?
Thank you very much for you help!!!
Oleg
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