MSPM0L1306: MSPM0L1306 Bootloader jump to application ends in Default_Handler

Part Number: MSPM0L1306

Hello,

I implemented a custom bootloader for the MSPM0L1306. The bootloader loads the main application into flash and then jumps to it. So the processor starts at 0x0000 inside the bootloader and the bootloader jumps on valid application code into the application.

The jump itself appears to work, but the application immediately ends up in the Default_Handler.

According to the map file of the main application, the vector table is located at 0x00003100.

Bootloader jump code:

#define APP_START_ADDRESS 0x00003100

#define SRAM_START 0x20000000

#define SRAM_END 0x20000F00

#define SHARED_RAM_START 0x20000F00

#define SHARED_RAM_SIZE 0x100

typedef void (*pFunction)(void);

void jumpToApplication(void)

{

  uint32_t appStack = *(volatile uint32_t *)APP_START_ADDRESS;

  uint32_t appReset = *(volatile uint32_t *)(APP_START_ADDRESS + 4);

  // Check if stack pointer is in RAM

  if ((appStack < SRAM_START) || (appStack > SRAM_END))

    return;

  // Check if ResetHandler is valid

  if (appReset == 0xFFFFFFFF)

    return;

  __disable_irq();

  // Disable all interrupts

  for (int i = 0; i < 8; i++) {

    NVIC->ICER[i] = 0xFFFFFFFF;

    NVIC->ICPR[i] = 0xFFFFFFFF;

  }

  // Stop SysTick

  SysTick->CTRL = 0;

  SysTick->LOAD = 0;

  SysTick->VAL = 0;

  /* Clear pending system interrupts */

  SCB->ICSR |= SCB_ICSR_PENDSVCLR_Msk;

  SCB->ICSR |= SCB_ICSR_PENDSTCLR_Msk;

  // Switch vector table

  SCB->VTOR = APP_START_ADDRESS;

  __DSB();

  __ISB();

  // Set stack pointer

  __set_MSP(appStack);

  // Jump to reset handler

  ((void (*)(void))appReset)();

}

Linker configuration of the main application:

FLASH_CODE (RX) : origin = 0x00003100, length = 0x0000CB00

Vector table placement:

.intvecs : > 0x00003100

Map file excerpt:

.intvecs   0    00003100    000000c0

                  00003100    000000c0     startup_mspm0l130x_ticlang.o (.intvecs)

Additional debugging information:

Before executing the jump I inspected the values in the debugger.

• appStack = 0x20000F00
• appReset = address of the application's Reset_Handler

Both values appear to be valid and match the expected values from the application image.

So the vector table appears to be correctly placed at 0x3100.

However, after jumping to the application, the program ends up in Default_Handler.

My questions:

1. Is this the correct procedure to jump from a bootloader to an application on MSPM0 devices?
2. Are there additional steps required when switching the vector table (SCB->VTOR)?
3. Could this behavior be related to the linker configuration or the startup code of the application?

Any suggestions or hints would be greatly appreciated.

Thank you!