Cortex-M1 and bootloading into RTX app

I have a Cortex-M1 system in an FPGA. I have 2KB of code that is mapped at address 0x0. It contains the vector table, code to load the SDRAM with application code from serial flash, and code to overwrite the vector table with the address of the application interrupts and the handlers for SVC, PendSV, and SysTick.

I can get this bootloader to work correctly with a non RTX application. But, if I use this simple RTX, my code sets a bit on the LCD outputs and then crashes in the os_sys_init(task_start) routine. My debugger gives me the error "Cannot stop Cortex-M device" and exits.

__task void task_agui_handler(void);
__task void task_start (void) ;
static U64 agui_stack[2048/8];
OS_TID task_ids[1];

int main (void)
{
        LCD_SET = 0x00000001;
        os_sys_init(task_start);
        while(1)
        {}

}

__task void task_start (void)
{
        LCD_SET = 0x00000002;



        task_ids[0]=os_tsk_create_user(task_agui_handler,2,&agui_stack,sizeof(agui_stack));
        if(!task_ids[0])
        {
           while(1){};
        }

        os_evt_set(0x0001,task_ids[0]);
        os_tsk_delete_self();

}

__task void task_agui_handler (void)
{
        OS_RESULT       result;

        LCD_SET = 0x00000004;

        while(1)
        {
                result = os_evt_wait_and(0x1,0xFFFF);

                switch(result)
                {
                        case OS_R_EVT:                          occurred

                                LCD_SET = 0x00000008;


                                break;
                        case OS_R_TMO:     // code should never get here (time out occurred during wait for event)
                                break;
                        default:                  // code should never get here
                                break;

                }


                os_tsk_pass();
        }

}

Is there something that looks wrong?

 RE: Cortex-M1 and bootloading into RTX app

Are you remapping VTOR?

 RE: Cortex-M1 and bootloading into RTX app

There is no VTOR on the Cortex-M1. I was able to discover that the problem is with the RTX-code running from external RAM. If I use the same bootloader, but put the RTX code into ITCM, everything works just fine. I'm guessing this was never tested.

 RE: Cortex-M1 and bootloading into RTX app

Sorry, I didn't read your post carefully enough. I'm not sure why it isn't working from the external RAM I don't see any reason why it shouldn't? Is there a max jump distance for the interrupt vectors?

 RE: Cortex-M1 and bootloading into RTX app

The hardware interrupts work fine and also the RTX when used without the os_evt_wait() functions. Only when these wait functions are used is there issues. So I don't think that is the issue either. There is a difference in read latency from external memory compared to the ITCM. The ITCM execute in 1 cycle and the external memory I believe is about 3.