i.MXRT1050 Plugin image

[lukaszskrzypcza]

Hi all,

I'm in the middle of development of custom bootloader for i.MXRT1050 family processor and I'd like to use 'Plugin image' functionality. So far I managed to invoke proper function described in manual :

typedef BOOLEAN (*plugin_download_f)(void **start, size_t *bytes, UINT32 *ivt_offset);

but booting of loaded image fails after return. My question is: exactly what values shall be returned in function parameters with respect to target image IVT ? Eg. *start should be the pointer to the very beginning of the image (eg. 0x80000000, where IVT starts @0x80001000) ?

Best regards, Lukasz

[tomajmich]

Hi Lukasz,

can give more details on how exactly you were able to invoke the function? How did you build the image? What binary did you use etc.?

Any help will be appreciated

Regards

Tomasz 

[diogocacador]

I'm also interested in this. Were you successful?

Regards,

Diogo

[lukaszskrzypcza]

Sorry for this delay.

No. I haven't manage to boot with Plugin Image. Instead I used common method of changing VTOR value to point to image new interrupt vector table and jumping to new reset vector. Code goes as follows:

...
typedef void (*pFunction)(void);
int main(void) {
    pFunction Jump_To_Application;
    uint32_t call_Addr;

    LoadImage(&call_Addr);
    getIVT(&call_Addr, &ivt);
    uint8_t *jump = (uint8_t*)ivt->entry;
    unsigned int * pSCB_VTOR = (unsigned int *) 0xE000ED08;
    *pSCB_VTOR = (unsigned int)jump;
    jump +=4;
    Jump_To_Application =  (pFunction) *(__IO uint32_t*) (jump);
    // Disable interrupts
    __asm volatile ("cpsid i");
    // Clear all pending interrupt flags & disable all NVIC interrupts
    for (int i = 0; i < (NMI_WAKEUP_IRQn + 1); i++) {
        NVIC_DisableIRQ(i);
        NVIC_ClearPendingIRQ(i);
    }
    Jump_To_Application();      //run application

    while(1); should never get here

    return 0;
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Not quite elegant but works.

Best regards, Lukasz

[jmesc_]

Hi Lukasz,

Interesting and classic approach always works ! just by curiosity what 

LoadImage(&call_Addr);

is doing ? in your case

Thanks

[b36401]

You can refer this example:
https://community.nxp.com/thread/302258
It is for i.MX6 processor but in i.MXRT there is nothing spechial in this point.

Have a great day,
Victor

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