s32K311 bootloader quesiton

[scott071209]

Hello ,

I have used same program. for K344, it's OK to jump from bootloader to APP. But when I used same way to test K311. it doesn't jump. Could you give some suggestion? Thanks.

        appStack= *(uint32_t *)(APP_START_ADDRESS);

        appEntry= *(uint32_t *)(APP_START_ADDRESS+0XC);

        //appEntry= *(uint32_t *)(APP_START_ADDRESS);

        appEntry= *(uint32_t *)((uint32_t)appEntry+0X4);

        //appEntry = (((uint32_t)appEntry)& 0xFFFFFFFEU);

        //(* (void (*) (void)) appEntry)();

        Bootup_Application(appEntry,appStack);

#define APP_START_ADDRESS 0X440200// APP 开始地址

void Bootup_Application(uint32_t appEntry, uint32_t appStack)

{

static void(*jump_to_application)(void);

static uint32_t stack_pointer;

/*把应用程序入口地址赋值给函数指针*/

jump_to_application = (void(*)(void))appEntry;

stack_pointer = appStack;

/*重新定向中断向量表*/

S32_SCB->VTOR = (uint32_t)APP_START_ADDRESS;

/*设置堆栈指针*/

__asm volatile("cpsie i": : : "memory");//关闭总中断指令

__asm volatile("MSR msp, %0 \n" : : "r" (stack_pointer) : "sp");//设置堆栈到mSP

__asm volatile("MSR psp, %0 \n" : : "r" (stack_pointer) : "sp");//设置堆栈到pSP

jump_to_application();

}

[lukaszadrapa]

Hi @scott071209 

if you step the asm code, where does it fail exactly? Can you see if correct address is used for jump?

Regards,

Lukas

[scott071209]

I  think it's right address.please see my code. Look foward your reply.Thanks.

[lukaszadrapa]

I'm afraid the attached projects do not correspond to your screenshot. I loaded them to my board and I can see:

Which leads to this after the jump:

... as expected considering the value in appEntry.

Regards,

Lukas

[scott071209]

Hello ,

 Sorry, It's old version. please see this latest version. Look forward your reply.Thanks.

[lukaszadrapa · Accepted solution]

Ok, it jumps to the application. But it fails on ITCM initialization. I found that it's caused by MPU configuration - ITCM is obviously protected against write. If I clear ENABLE bit in core register MPU_CTRL, it works. So, you should deinit also the MPU before the jump.

Regards,

Lukas

[scott071209]

Dear,

    I want to know how to confirm ITCM initialization fail. I check attachment picture. there is no fault.

Also please tell why ITCM initialization fail will have an effect on jump? Thanks.

[scott071209]

Hello Lukas,
It's Ok. Thanks .