How to create a bootloader process?

lihens — Tue, 18 Dec 2018 13:25:59 GMT

Hi,

I'm working with MK12DN512VMC5 and trying to create a bootloader process.
I burn my chip with 2 versions (the first is the bootloader and the second is the "application" version) into two different locations. I created a jump function (from the bootloader) and when the jump occurred, my application version didn't start.
What could be the reason for that? Am I missing something related to the bootloader process?

Thank you

Re: How to create a bootloader process?

mjbcswitzerland — Thu, 20 Dec 2018 17:48:38 GMT

See the appendix of http://www.utasker.com/docs/uTasker/uTaskerSerialLoader.pdf

for a check list of things to consider for boot loader and application compatibility.

You can also use the various loaders in the document on a K12 in case you prefer an off-the-shelf solution over redeveloping one.

Regards

Mark

Re: How to create a bootloader process?

kerryzhou — Fri, 21 Dec 2018 10:53:25 GMT

Hi Lihen Sternfeld,

How you jump to the relocated application code address?

Do you relocate the SP, and the VTOR register?

This is the jump code from the kboot2.0:

static void jump_to_application(uint32_t applicationAddress, uint32_t stackPointer)
{
#if BL_FEATURE_OTFAD_MODULE
    quadspi_cache_clear();
    oftfad_resume_as_needed();
#endif

    shutdown_cleanup(kShutdownType_Shutdown);

    // Create the function call to the user application.
    // Static variables are needed since changed the stack pointer out from under the compiler
    // we need to ensure the values we are using are not stored on the previous stack
    static uint32_t s_stackPointer = 0;
    s_stackPointer = stackPointer;
    static void (*farewellBootloader)(void) = 0;
    farewellBootloader = (void (*)(void))applicationAddress;

    // Set the VTOR to the application vector table address.
    SCB->VTOR = (uint32_t)APP_VECTOR_TABLE;

    // Set stack pointers to the application stack pointer.
    __set_MSP(s_stackPointer);
    __set_PSP(s_stackPointer);

    // Jump to the application.
    farewellBootloader();
    // Dummy fcuntion call, should never go to this fcuntion call
    shutdown_cleanup(kShutdownType_Shutdown);
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Wish it helps you!

Have a great day,
Kerry

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