I.MX RT1021 BootLoader problems in XIP mode.

[diangongcxq]

Hi,Good morning.

I am using i.mx RT1020 to develop projects .Now，i want to develop a bootLoader that can jump to address other than 0x60000000。But i have some problems,the following steps:

1.I've written a bootloader than can store ".binary" app file to address 0x60400000.Execute the following instructions after running:

   JumpApplication1(0x60400000,0x60400004);

 __STATIC_FORCEINLINE void JumpApplication1(uint32_t topOfMainStack, uint32_t AppliAddr)

{
__ASM volatile ("mov r13, %0" : : "r" (topOfMainStack) : );
__ASM volatile ("mov r15, %0" : : "r" (AppliAddr) : );
}

2.So my app program performs the operation as attachment 1 and generates binary file as attachment 2 ,map file as attachment    3.

But the app program is not running after the jump。So I don't know what's wrong with the above operation。

Please give me your help。

Thanks。

[jeremyzhou]

Hi ,

Thank you for your interest in NXP Semiconductor products and
for the opportunity to serve you.
1) Firstly, you should assure the bootloader program is good, it means it can work well when debugging it independently.
2) I think it can use below jump_to_application function instead of the previous one.

//! @brief Exits bootloader and jumps to the user application.
static void jump_to_application(uint32_t applicationAddress, uint32_t stackPointer)
{


    // 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();
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Have a great day,
TIC

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[diangongcxq]

What is APP_VECTOR_TABLE?

[jeremyzhou]

Hi ,

Thanks for your reply and sorry for making you confused.
The APP_VECTOR_TABLE is the address of the application vector table which equals the stackPointer.

Have a great day,
TIC

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