KBOOT ROM never executes application, bootloops

xxxajk · ‎09-14-2017

As the title says, just reenters ROM after timeout.

MKE16F512VLH16

K1.5.1 ROM

BCA:

0x3c0: 6b 63 66 67 ff ff ff ff ff ff ff ff ff ff ff ff
0x3d0: ff ff e8 03 ff ff ff ff ff ff ff ff ff ff ff ff
0x3e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x3f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

Flash configuration field:

0x400: ff ff ff ff ff ff ff ff ff ff ff ff de fb ff ff

^^

||

boot from rom

If I disable ROM and only enable with BOOT0 pin, the application runs as expected.

Two quesions to help resolve the issue:

Is there something the ROM configs that is causing a fault in my start up code? I can post my start up code if required.

Does Zeroing RAM at start up of app cause the fault?

jorge_a_vazquez · ‎09-26-2017

Hi Andrew

Actually, your application is executing after timeout, the problem is that the WDOG interrupt is happening and you get into the ROM bootloader again.

There is a Errata in this chip about the WDOG, please check the following link: https://www.nxp.com/docs/en/errata/Kinetis_E_0N79P.pdf

So, when you boot from the ROM bootloader and then jump to the application, you need a delay before you continuing your program execution. I added a little delay in the Reset Handler, so now my application can run without problems.

void ResetISR(void) {
     unsigned int i=100;
         while(i--){}
    // Disable interrupts
    __asm volatile ("cpsid i");
#if defined (__USE_CMSIS)
// If __USE_CMSIS defined, then call CMSIS SystemInit code
    SystemInit();
...‍‍‍‍‍‍‍‍‍

Inside the SystemInit you will find the WDOG disable.

Hope this could help you,

Best Regards

Jorge Alcala

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xxxajk · ‎09-14-2017