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problems with secondary bootloader on LPC1768 with MCP1700

Hubert Mößlein

I'm using µVision 4.50.0.0 with Keil MCB1700 with LPC1768.

I wrote a secondary boot-loader, that reads srecord file from usb and writes that into flash starting 0x20000.
The AN10866.pdf from NXP helped a lot.

The application itself is built with following changes:
Target Options IROM1 Start 0x20000 Size 0x60000
Asm options Define NO_CRP.

The following code should start my application after
successful update/validating the present firmware:

#define APPL_RUN_ADDR           0x00020000

__asm void boot_jump(U32 address)
{
    LDR SP, [R0]
    LDR PC, [R0, #4]
}


void run_appl()
{
     SCB->VTOR = APPL_RUN_ADDR & 0x1FFFF80;

    boot_jump(APPL_RUN_ADDR);
}


This code snippet is copied from nxp's AN10866.pdf, too.

But the firmware doesn't start reliable. Where do I stuck?

APPL_RUN_ADDR is defined to 0x20000

at 0x20004 there's 00020229 (this is the Reset_Handler fro my application, which I checked in the map file).

Unfortunately I don't find the AN10866.zip example files, to see how nxp's bootloader was built exactly.

What else have I forgotten to do?

Thanks in advance
Hubert

Parents
  • 0 in reply to Hubert Mößlein

    O.K.

    Now I found the solution to start the application located at APPL_RUN_ADDR = 0x20000 reliably.

    before changing the vector table the irq's have to be disabled in the bootloader.

    
__asm void boot_jump(U32 address)
{
    LDR SP, [R0]
    LDR PC, [R0, #4]
}

void run_appl()
{

//   void (*user_code_entry)(void);

   /* Change the Vector Table to the USER_FLASH_START
   in case the user application uses interrupts */

     __disable_irq();
     LPC_SC->PCONP = 0x001817BE;
     SCB->VTOR = APPL_RUN_ADDR & 0x1FFFF80;
     boot_jump(APPL_RUN_ADDR);
}

    and in the application the irq's have to be enabled again before calling os_sys_init()!!!

    int main (void)
{
  __enable_irq();
  os_sys_init(init);                        /* Initialize RTX and start init */
}

    The bootloader is compiled with IROM1 Start=0x0 Size = 0x20000

    The application is compiled with IROM1 Start=0x20000 Size = 0x60000 and Asm Define = NO_CRP

    Hubert

Reply
  • 0 in reply to Hubert Mößlein

    O.K.

    Now I found the solution to start the application located at APPL_RUN_ADDR = 0x20000 reliably.

    before changing the vector table the irq's have to be disabled in the bootloader.

    
__asm void boot_jump(U32 address)
{
    LDR SP, [R0]
    LDR PC, [R0, #4]
}

void run_appl()
{

//   void (*user_code_entry)(void);

   /* Change the Vector Table to the USER_FLASH_START
   in case the user application uses interrupts */

     __disable_irq();
     LPC_SC->PCONP = 0x001817BE;
     SCB->VTOR = APPL_RUN_ADDR & 0x1FFFF80;
     boot_jump(APPL_RUN_ADDR);
}

    and in the application the irq's have to be enabled again before calling os_sys_init()!!!

    int main (void)
{
  __enable_irq();
  os_sys_init(init);                        /* Initialize RTX and start init */
}

    The bootloader is compiled with IROM1 Start=0x0 Size = 0x20000

    The application is compiled with IROM1 Start=0x20000 Size = 0x60000 and Asm Define = NO_CRP

    Hubert

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