Jump to application from bootloader

ravindralature · ‎06-18-2018

Hello NXP team/developers,
I am using S32K144.

Flash bootloader : 0x00-0xc000

Application : 0xc000-0x7ffff

Application reset handler : 0xc401(thumb instruction set)

Problem: After jumping to application, it stucks in OS_enable_interrupt function.

Below are some scenarioes :

Case 1: Flashed only application, it works fine.

Case 2: Flashed both FBL and application. Application stucks in hardfault.

Case 3: Flashed both FBL and application. Erased FBL first sector(0x00-0xFFF), Application works fine.

Also, in application startup file, VTABLE is reassigned to VTOR_Reg.

Why application is not running with FBL?

Thank you in advance.

dianabatrlova · ‎06-20-2018

Hi Ravindra,

For the jump to the application from bootloader, you can use the function below:

void startApplication(unsigned long app_link_location)

{

S32_SCB->VTOR=(uint32_t)(app_link_location);
asm(" ldr sp, [r0,#0]");
asm(" ldr pc, [r0,#4]");

}

The fault handler could be useful see Fault handling on S32K144

Best regards,

Diana