Problem with exiting the second bootloader and jumping to user application on i.MXRT1061.

cerma — Wed, 12 May 2021 12:36:25 GMT

Hi all,
I have a Second Bootloader and a burned user application (checked for correct burning). I want to exit bootloader and jump to the user application. After performing the void jump_to_application function (uint32_t applicationAddress, uint32_t stackPointer), the processor is reset immediately. Can anyone advise me on what I am doing wrong? I followed AN12604SW. The code is located in the SPI flash.

I use i.MXRT1061, MCUXpresso11.3, SDK2.9.1 and custom board.

My code:

#define APPLICATION_ADDRESS 0x60040000
#define STACK_POINTER 0x60040004

//! @brief Exits bootloader and jumps to the user application.
//AT_QUICKACCESS_SECTION_CODE(void jump_to_application(uint32_t applicationAddress, uint32_t stackPointer));
void jump_to_application(uint32_t applicationAddress, uint32_t stackPointer)
{
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)0x60040000;//APP_VECTOR_TABLE; 0x60000000 0x60040000

// 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);
}

void shutdown_cleanup(shutdown_type_t shutdown)
{
// If we are permanently exiting the bootloader, there are a few extra things to do.
if (shutdown == kShutdownType_Shutdown)
{
// Turn off global interrupt
///lock_acquire();
__disable_irq();

// Shutdown microseconds driver.
///microseconds_shutdown();

// Disable force ROM.
#if defined(RCM_FM_FORCEROM_MASK)
RCM->FM = ((~RCM_FM_FORCEROM_MASK) & RCM->FM) | RCM_FM_FORCEROM(0);
#elif defined(SMC_FM_FORCECFG_MASK)
#if defined(SMC0)
SMC0->FM = ((~SMC_FM_FORCECFG_MASK) & SMC0->FM) | SMC_FM_FORCECFG(0);
#else
SMC->FM = ((~SMC_FM_FORCECFG_MASK) & SMC->FM) | SMC_FM_FORCECFG(0);
#endif
#endif // defined(RCM_FM_FORCEROM_MASK)

// Clear status register (bits are w1c).
#if defined(RCM_MR_BOOTROM_MASK)
RCM->MR = ((~RCM_MR_BOOTROM_MASK) & RCM->MR) | RCM_MR_BOOTROM(3);
#elif defined(SMC_MR_BOOTCFG_MASK)
#if defined(SMC0)
SMC0->MR = ((~SMC_MR_BOOTCFG_MASK) & SMC0->MR) | SMC_MR_BOOTCFG(3);
#else
SMC->MR = ((~SMC_MR_BOOTCFG_MASK) & SMC->MR) | SMC_MR_BOOTCFG(3);
#endif
#endif // defined(RCM_MR_BOOTROM_MASK)

init_interrupts();

// Set the VTOR to default.
SCB->VTOR = 0;//kDefaultVectorTableAddress;

// Restore clock to default before leaving bootloader.
//configure_clocks(kClockOption_ExitBootloader);

// De-initialize hardware such as disabling port clock gate
///deinit_hardware();
LPUART_Deinit(LPUART1_PERIPHERAL);

// Restore global interrupt.
//__enable_irq();

#if BL_FEATURE_BYPASS_WATCHDOG
// De-initialize watchdog
bootloader_watchdog_deinit();
#endif // BL_FEATURE_BYPASS_WATCHDOG
}

// Memory barriers for good measure.
__ISB();
__DSB();
}

Thank you for answer.

Jaroslav C.

Re: Problem with exiting the second bootloader and jumping to user application on i.MXRT1061.

cerma — Thu, 27 May 2021 11:35:52 GMT

Hi,

The problem is solved. I finally used the function:

#define BL_APP_VECTOR_TABLE_ADDRESS 0x60040000
#define APP_VECTOR_TABLE ((uint32_t *)BL_APP_VECTOR_TABLE_ADDRESS)

void goToApp()
{
static void (*farewellBootloader)(void) = 0;
farewellBootloader = (void (*)(void))(APP_VECTOR_TABLE[1]);
SCB->VTOR = (uint32_t)APP_VECTOR_TABLE;
__set_MSP(APP_VECTOR_TABLE[0]);
__set_PSP(APP_VECTOR_TABLE[0]);
farewellBootloader();
}

Jaroslav C.

i.MX RT Crossover MCUsのトピックProblem with exiting the second bootloader and jumping to user application on i.MXRT1061.

Problem with exiting the second bootloader and jumping to user application on i.MXRT1061.

Re: Problem with exiting the second bootloader and jumping to user application on i.MXRT1061.